Right to get out for a duck? Nonsense! (3)

I believe the answer is:

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'duck? nonsense' is the definition.
'rot' can be an answer for 'nonsense' (rot can mean nonsense or rubbish). I'm not sure about the 'duck?' bit.

'right to get out' is the wordplay.
'right' becomes 'r' (common abbreviation).
'get out' indicates anagramming the letters (the letters get out of order).
'to' anagrammed gives 'ot'.
'r'+'ot'='ROT'

'for a' is the link.

Can you help me to learn more?

(Other definitions for rot that I've seen before include "Drivel" , "Balderdash" , "Decay, go bad" , "Informal nonsense" , "Paradise" .)

I've seen this clue in the Evening Standard.

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