Crossword Genius

Not one younger, would you believe? (2,4)

Ross

I believe the answer is:

no less

'would you believe?' is the definition.
('no less' is said after a surprising claim)

'not one younger' is the wordplay.
'not' becomes 'no' (I've seen this in other clues).
'one younger' becomes 'less'.
'no'+'less'='NO LESS'

(Other definitions for no less that I've seen before include "Phrase used to emphasise admiration or surprise" , "Ironic comment - just as much" , "praise, ironically" , "would you believe!" , "as important" .)

I've seen this clue in The Telegraph.
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