Pick up snag (5)
I believe the answer is:
catch
I believe this is a double definition.
'pick up' is the first definition.
(I know that pick up can be written as catch)
'snag' is the second definition.
(I know that snag is a more specific form of the action catch)
(Other definitions for catch that I've seen before include "Something trapped" , "Understand" , "Grab hold of - fastener" , "(To) snare, net" , "Disadvantage that's hidden" .)