French soldier's hat found in snake pit (4)
I believe the answer is:
kepi
'french soldier's hat' is the definition.
(I've seen this in another clue)
'in snake pit' is the wordplay.
'in' says the answer is hidden in the clue.
'KEPI' is hidden in the letters of 'snake pit'.
'found' is the link.
(Other definitions for kepi that I've seen before include "French military hat" , "French military headgear" , "Service cap" , "Flat-topped military cap" , "Military cap with circular top" .)