Witty article on reflection (7)
I believe the answer is:
amusing
'witty' is the definition.
(thesaurus)
'article on reflection' is the wordplay.
'article' becomes 'a' (indefinite article).
'on' is a charade indicator (letters next to each other).
'reflection' becomes 'musing' ('musing' can be a synonym of 'reflection').
'a'+'musing'='AMUSING'
(Other definitions for amusing that I've seen before include "Pleasantly diverting" , "Droll" , "Pleasantly entertaining" , "might be funny" , "comic" .)