More dull praise? (7)
I believe the answer is:
flatter
This clue is a double definition.
'more dull' is the first definition.
('flat' can be a synonym of 'dull')
'praise?' is the second definition.
(flattering is a kind of praising)
(Other definitions for flatter that I've seen before include "Fawn, blandish" , "Comparatively deflated" , "Less uneven, soft-soap" , "Use soap" , "suit, looking good" .)