Snatch torn garb (4)
I believe the answer is:
grab
'snatch' is the definition.
('grab' can be a synonym of 'snatch')
'torn garb' is the wordplay.
'torn' indicates anagramming the letters.
'garb' is an anagram of 'GRAB'.
(Other definitions for grab that I've seen before include "Seize hold of" , "Grasp roughly" , "Impress" , "Brag about seizure" , "Seize roughly" .)