Young animal in trap set up under equipment (6)
I believe the answer is:
kitten
'young animal' is the definition.
(I've seen this before)
'trap set up under equipment' is the wordplay.
'trap' becomes 'net' (net is a kind of trap).
'set up' is a reversal indicator.
'under' says to put letters next to each other.
'equipment' becomes 'kit' (kit is a kind of equipment**).
'net' written backwards gives 'ten'.
'ten' after 'kit' is 'KITTEN'.
'in' is the link.
(Other definitions for kitten that I've seen before include "found in litter" , "Young of a beaver" , "New cat" , "Baby cat" , "Young rabbit" .)