Sell a foxtrot record (4)
I believe the answer is:
flog
'sell' is the definition.
(I've seen this before)
'a foxtrot record' is the wordplay.
'a foxtrot' becomes 'f' (phonetic alphabet: alpha, bravo, charlie etc.).
'record' becomes 'log' (logging is a kind of recording).
'f'+'log'='FLOG'
(Other definitions for flog that I've seen before include "- - a dead horse" , "Scourge, whip" , "Beat with whip or slangily sell" , "Thrash" , "-- Hitler" .)