Crocodile yesterday returned holding body part (6)
I believe the answer is:
eyelid
'body part' is the definition.
(eyelid is a kind of body part)
'crocodile yesterday returned holding' is the wordplay.
'holding' indicates a hidden word.
'returned' says the letters should be written backwards.
'dileye' can be found hidden inside 'crocodile yesterday'.
'dileye' back-to-front is 'EYELID'.
(Other definitions for eyelid that I've seen before include "Covering for organ of sight" , "Skin over viewer" , "Natural ocular protector" , "Covering for 27 across" , "Natural optical protector" .)