Crossword Genius

Infection forces error (5)

Ross

I believe the answer is:

fluff

'error' is the definition.
(fluff is a kind of error)

'infection forces' is the wordplay.
'infection' becomes 'flu' (I've seen this before).
'forces' becomes 'ff' (I've seen this in other clues).
'flu'+'ff'='FLUFF'

(Other definitions for fluff that I've seen before include "Mistake; soft fibres", "blooper", "Deliver badly", "Mess up", "mistake made by some player in action?".)

I've seen this clue in The Daily Mail.
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