Obtain craftily bit of wine with fish (6)
I believe the answer is:
wangle
'obtain craftily' is the definition.
(I've seen this before)
'bit of wine with fish' is the wordplay.
'bit of' indicates taking the first letters.
'with' means one lot of letters go next to another.
'fish' becomes 'angle' (angling is a kind of fishing**).
The first letter of 'wine' is 'w'.
'w'+'angle'='WANGLE'
(Other definitions for wangle that I've seen before include "Use craft to get" , "Obtain or arrange by using trickery" , "Manipulate - falsify (a situation etc)" , "Obtain through influence" , "Bring about by scheming" .)