Hidden crop covered with fresh seed (8)
I believe the answer is:
eclipsed
'hidden' is the definition.
(I've seen this before)
'crop covered with fresh seed' is the wordplay.
'crop' becomes 'clip' (synonyms).
'covered with' is an insertion indicator.
'fresh' indicates anagramming the letters.
'seed' with letters rearranged gives 'esed'.
'clip' put within 'esed' is 'ECLIPSED'.
(Other definitions for eclipsed that I've seen before include "Hidden" , "Surpassed - led epics (anag)" , "Overshadowed" , "Obscured as by heavenly body" , "Deprived of prominence" .)