Track suit opening broke (5)
I believe the answer is:
spoor
'track' is the definition.
(track left by an animal)
'suit opening broke' is the wordplay.
'opening' indicates taking the first letters.
'broke' becomes 'poor' (similar in meaning).
The first letter of 'suit' is 's'.
's'+'poor'='SPOOR'
(Other definitions for spoor that I've seen before include "Animal track or scent" , "Trace" , "Beast's trail" , "Animal's track/scent" , "Animal track, trail" .)