Crossword Genius

Talk of fish and duck (5)

Ross

I believe the answer is:

lingo

'talk' is the definition.
(thesaurus)

'fish and duck' is the wordplay.
'fish' becomes 'ling' (ling is a kind of fish**).
'and' means one lot of letters go next to another.
'duck' becomes 'o'.
'ling'+'o'='LINGO'

'of' is the link.

(Other definitions for lingo that I've seen before include "speech" , "Argot" , "special words" , "French?" , "strange language" .)

I've seen this clue in the Evening Standard.
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