Copy part of the choreography that's followed by foxtrot (4)
I believe the answer is:
echo
'that's followed by foxtrot' is the definition.
(in the NATO Phonetic Alphabet)
'copy part of the choreography' is the wordplay.
'ECHO' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.
(Other definitions for echo that I've seen before include "Ape" , "Nymph whose love Narcissus spurned" , "repetitive" , "Reiterate" , "Greek girl in love with Narcissus" .)