Body part Henry trapped in vice (4)
I believe the answer is:
shin
'body part' is the definition.
(shin is a kind of body part)
'henry trapped in vice' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'trapped in' means one lot of letters goes inside another.
'vice' becomes 'sin'.
'h' put inside 'sin' is 'SHIN'.
(Other definitions for shin that I've seen before include "kick" , "Climb" , "Lower foreleg" , "Long bone between knee and ankle" , "Front part of the leg between knee and ankle" .)