Bandleader dismisses bard as dull (6)

I believe the answer is:

leaden

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'dull' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for leaden that I've seen before include "Depressing - heavy" , "Oppressive" , "Heavy - overcast" , "Gloomy - slow-moving" , "Describes grey overcast skies" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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