Happen to get new suspect-tracing aid - it's an advantage (7)
I believe the answer is:
benefit
'an advantage' is the definition.
(I've seen this before)
'happen to get new suspect-tracing aid' is the wordplay.
'happen' becomes 'be'.
'to get' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'suspect tracing aid' becomes 'efit' (I can't justify this - if you can you should give a lot more credence to this answer).
'be'+'n'+'efit'='BENEFIT'
'it's' is the link.
Can you help me to learn more?
(Other definitions for benefit that I've seen before include "Fine bet (anag)" , "Advantage or profit gained from something" , "Charity event" , "Handout" , "Fine bet on to produce an advantage" .)