With less humour? (3)
I believe the answer is:
wit
'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'
Can you help me to learn more?
(Other definitions for wit that I've seen before include "Acuity" , "Maker of clever remarks" , "card" , "Mental ability" , "Good sense" .)