Deception, fishy fizzy drink? (7)
I believe the answer is:
charade
'deception' is the definition.
(I've seen this in another clue)
'fizzy drink?' is the wordplay.
'fizzy' becomes 'char' (I am not sure about this - if you are sure you should believe this answer much more).
'drink?' becomes 'ade' (I've seen this in another clue).
'char'+'ade'='CHARADE'
'fishy' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
(Other definitions for charade that I've seen before include "Blatant deception" , "Farce - mime" , "Sustained pretence" , "Farcical pretence" , "absurd behaviour" .)