Returning crocodile yet to eat part of body (6)
I believe the answer is:
eyelid
'part of body' is the definition.
'returning crocodile yet to eat' is the wordplay.
'returning' says the letters should be written backwards.
'to eat' indicates a hidden word (I've seen 'eating' mean this).
'dileye' is hidden in the letters of 'crocodile yet'.
'dileye' in reverse letter order is 'EYELID'.
(Other definitions for eyelid that I've seen before include "Blinking cover" , "Natural optic cover" , "Covering for 27 across" , "Natural optical cover" , "It's used in blinking" .)