Crossword Genius

With less humour? (3)

Ross

I believe the answer is:

wit

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'humour?' is the definition.
('wit' can be a synonym of 'humour')

'with less' is the wordplay.
'with' becomes 'w' (abbreviation).
'less' becomes 'it' (I can't explain this - if you can you should believe this answer much more).
'w'+'it'='WIT'

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(Other definitions for wit that I've seen before include "Acuity" , "Maker of clever remarks" , "card" , "Mental ability" , "Good sense" .)

I've seen this clue in the Evening Standard.
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