Match found in sea green (5)
I believe the answer is:
agree
'match' is the definition.
(as in two tallies agreeing or matching)
'in sea green' is the wordplay.
'in' says the answer is hidden in the clue.
'AGREE' can be found hidden inside 'sea green'.
'found' acts as a link.
(Other definitions for agree that I've seen before include "Have the same opinion" , "Match; tally" , "share the same view" , "'Birds in their little nest . . . . .'" , "get on" .)