Girl grabbing new belt (4)
I believe the answer is:
zone
'belt' is the definition.
(I've seen this before)
'girl grabbing new' is the wordplay.
'girl' becomes 'zoe' (**).
'grabbing' indicates putting letters inside.
'new' becomes 'n'.
'zoe' enclosing 'n' is 'ZONE'.
(Other definitions for zone that I've seen before include "Section" , "Marked area" , "Bitter, pungent" , "Distinctive area" , "Region; time area" .)