Different part of snare (4)
I believe the answer is:
trap
'snare' is the definition.
(I know that snare can be written as trap)
'different part' is the wordplay.
'different' indicates an anagram.
'part' with letters rearranged gives 'TRAP'.
'of' is the link.
(Other definitions for trap that I've seen before include "Means of transport - sometimes sprung!" , "ladder" , "Driver's obstacle" , "that may catch a speeding motorist" , "Deceive" .)