Somehow nears trap (5)
I believe the answer is:
snare
'trap' is the definition.
(I know that trap can be written as snare)
'somehow nears' is the wordplay.
'somehow' indicates an anagram.
'nears' is an anagram of 'SNARE'.
(Other definitions for snare that I've seen before include "Kind of trap, often with noose" , "Entrap" , "Wire on drum; trap" , "Loop of wire as trap" , "Pitfall" .)