Seize outlandish garb (4)
I believe the answer is:
grab
'seize' is the definition.
(grabbing is a kind of seizing)
'outlandish garb' is the wordplay.
'outlandish' indicates anagramming the letters.
'garb' with letters rearranged gives 'GRAB'.
(Other definitions for grab that I've seen before include "Grasp roughly" , "Seize roughly" , "Seize suddenly" , "Take quickly" , "interest" .)