The snag is, you may drop it! (5)
I believe the answer is:
catch
'the snag' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for catch that I've seen before include "Getting round" , "Grab; trick; fastener" , "Desirable partner" , "Fastener on door or window" , "Ensnare" .)