Blotto nan's stopping before gin (7)
I believe the answer is:
ensnare
'gin' is the definition.
(I know that ensnare is a is a kind of of gin)
'blotto nan's stopping before' is the wordplay.
'blotto' indicates anagramming the letters.
'stopping' is an insertion indicator (stopping can mean blocking a gap).
'before' becomes 'ere' (poetic term for 'before').
'nans' is an anagram of 'nsna'.
'nsna' inserted into 'ere' is 'ENSNARE'.
(Other definitions for ensnare that I've seen before include "Capture, trap" , "Ambush" , "Ecstatic expression of feeling" , "Catch as if in a trap or net" .)