More feeble play on words? That is right (6)
I believe the answer is:
punier
'more feeble' is the definition.
'play on words? that is right' is the wordplay.
'play on words?' becomes 'pun' ('pun' can be a synonym of 'play on words').
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'right' becomes 'r' (common abbreviation).
'pun'+'ie'+'r'='PUNIER'
(Other definitions for punier that I've seen before include "Comparatively feeble" , "Feebler" .)