Double whiskey — canned? (4)
I believe the answer is:
twin
'double' is the definition.
(I've seen this before)
'whiskey canned?' is the wordplay.
I cannot really see how this works, but
'whiskey' could be 'w' (alpha bravo charlie delta ...) and 'w' is located in the answer.
The remaining letters 'tin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
(Other definitions for twin that I've seen before include "eg Pollux or Remus" , "One of an identical pair" , "English poet" , "One of two conceived simultaneously" , "Duplicate copy" .)