Grasp there's some unforeseen drawback (5)
I believe the answer is:
catch
This clue could be a double definition.
'grasp' is the first definition.
(I've seen this before)
'some unforeseen drawback' is the second definition.
'catch' can be an answer for 'drawback' (I have seen 'Hidden drawback ' mean 'catch' so perhaps 'drawback' could also mean 'catch'). I'm unsure of the 'some unforeseen' bit.
'there's' is the link.
Can you help me to learn more?
(Other definitions for catch that I've seen before include "Seize - drawback" , "(To) snare, net" , "Hidden drawback" , "problem in small print?" , "Accurately detect" .)