Foxtrot preceder (4)
I believe the answer is:
echo
'foxtrot preceder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for echo that I've seen before include "Nymph (only able to repeat the last words of others)" , "Radio operator's word for 'E'" , "Reminder" , "Reproduction" , "Reflected radar beam" .)