Dull sort of bard (4)
I believe the answer is:
drab
'dull sort of bard' is the definition.
(I've seen this before)
'of bard' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'bard' anagrammed gives 'DRAB'.
(Other definitions for drab that I've seen before include "Dull kind of bard" , "Colourless like bard" , "Sombre" , "Gloomy" , "Rather dull" .)