Quickly grab fragment (6)
I believe the answer is:
snatch
I believe this clue is a double definition.
'quickly grab' is the first definition.
(to snatch something up quickly)
'fragment' is the second definition.
(as in hearing a snatch of a song)
(Other definitions for snatch that I've seen before include "pluck" , "Snippet" , "Seize suddenly" , "Forcibly remove" , "heist" .)