Roam around after a scent (5)
I believe the answer is:
aroma
'scent' is the definition.
(synonyms)
'roam around after a' is the wordplay.
'around' indicates anagramming the letters.
'after' says to put letters next to each other.
'roam' with letters rearranged gives 'arom'.
'arom'+'a'='AROMA'
(Other definitions for aroma that I've seen before include "Perfume" , "Stink" , "particular charm" , "Pervasive atmosphere" , "Distinctive scent" .)