Record first half of find (4)
I believe the answer is:
disc
'record' is the definition.
(synonyms)
'first half of find' is the wordplay.
'first half of' means to take half the letters.
'find' becomes 'discover' (synonyms).
'discover' halved is 'DISC'.
(Other definitions for disc that I've seen before include "Part of flower" , "Layer of cartilege between vertebrae" , "Forty-five" , "Flat, circular plate - record" , "something moving in the spine" .)