From the book "Essex Institute Historical Collections [Historical Collections of the Essex Institute]" ( https://archive.org/details/essexinstitutehi68esse/page/92/mode/1up ), it appears Edward was alive in 1685:
“Thomas Johnson of Andover, and Marcy, ye relict of Ephraim Davis of Haverhill, and now wife of Edward Clark of Haverhill, as admrs. To the estate of Ephraim Davis, for 15 li. Convey to Thomas Whittier sen. Of Haverhill, in order to ye permit of ye Genll Court of Boston, July 7, 1685,…”
https://babel.hathitrust.org/cgi/pt?id=wu.89066183567&view=1up&...
From another source, it states:
“In 1685, EDWARD CLARK and about twenty other men were cited for fencing in their own land, certain portions of the “Town’s ways and common lands.” EDWARD has erroneously, been said to have died in 1695, for he was eighty0-nine or ninety years old he made a deed, December 19, 1710, which he acknowledged three days later, whereby he gave “for love and fatherly affection to son Hanel Clarke of Haverhill for his care, dutiful and childlike affection in providing and maintaining me for this several years past, and in my old age in trust of him for future care, all lands and rights not before disposed of.” The lack of reference to his wife suggests that she had died previously.
“The children of EDWARD and DORCAS (BOSWORTH) CLARK, all born in Haverhill, were:
I. Hanniel, see following
II. Matthew, died before June 6, 1715; m. at Haverhill April 2, 1679, Mary (Dow) Wilford. She was born April 26, 1644, the daughter of Thomas and Phebe (_____) Dow of Haverhill, and was the widow of Gilbert Wilford whom she had married by or before 1667, and who died before July 28, 1676.
III. Joseph, b. Mar. 6, 1653-4; d. in or before 1705; m. Aug. 18, 1685, his step-sister Mary Davis (Ephraim, James). Jotham Hendricks (Daniel) who had m. Hannah (Foster) Austin, assisted in Settling the estate of Joseph Clark.”
Dawes-Gates ancestral lines. A memorial volume ... v. 1 https://babel.hathitrust.org/cgi/pt?id=wu.89066183567&view=1up&...
"Find a Grave Index" does shows a death date of 13 Feb 1681, but "Global, Find a Grave Index" leaves the death year field blank.