Humour with appeal (3)
I believe the answer is:
wit
'humour' is the definition.
(I know that humour can be written as wit)
'with appeal' is the wordplay.
'with' becomes 'w' (abbreviation).
'appeal' becomes 'it' ('it' can mean something attractive or appealing).
'w'+'it'='WIT'
(Other definitions for wit that I've seen before include "Funny person" , "clever speaker" , "card" , "Intelligence; humorist" , "Humour or mental capacity" .)