It's as well to duck! (3)

I believe the answer is:

too

'it's as well' is the definition.
(both can mean 'also')

'to duck' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'to'+'o'='TOO'

(Other definitions for too that I've seen before include "On top - also" , "As well; in addition" , "As well, also" , "To a greater than desirable extent" , "Excessively" .)

I've seen this clue in the Evening Standard.

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