Step around vermin (4)
I believe the answer is:
pest
'vermin' is the definition.
'step around' is the wordplay.
'around' is an anagram indicator.
'step' anagrammed gives 'PEST'.
(Other definitions for pest that I've seen before include "Menace" , "Plague" , "Aphis" , "Nuisance; half a European capital" , "Constant nuisance" .)