Crossword Genius

Sauce is something unwelcome on duck (5)

Ross

I believe the answer is:

pesto

'sauce' is the definition.
(I've seen this before)

'something unwelcome on duck' is the wordplay.
'something unwelcome' becomes 'pest'.
'on' is a charade indicator (letters next to each other).
'duck' becomes 'o'.
'pest'+'o'='PESTO'

'is' is the link.

(Other definitions for pesto that I've seen before include "Pasta sauce mainly of basil and cheese" , "sauce involving Basil" , "Pasta sauce variety" , "Sauce made of basil and cheese" , "Basil-based sauce" .)

I've seen this clue in The Telegraph.
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