Inscription on a tombstone (7)
I believe the answer is:
epitaph
'inscription on a tombstone' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for epitaph that I've seen before include "Gravestone message" , "RIP, for example" , "Words inscribed on a tomb" , "Pit heap (anag)" , "Words written on tombstone" .)