Crossword Genius

A doctor not one for a dull speech (8)

Ross

I believe the answer is:

monotone

I'm a little stuck... Click here to teach me more about this clue!

'dull speech' is the definition.
'monotone' can be an answer for 'speech' (monotone is a kind of speech). I'm unsure of the 'dull' bit.

'a doctor not one for a' is the wordplay.
'a doctor' becomes 'mo' (medical officer).
'one for' is a charade indicator (letters next to each other).
'a' becomes 'one'.
'mo'+'not'+'one'='MONOTONE'

Can you help me to learn more?

(Other definitions for monotone that I've seen before include "Single unvaried sound level" , "Flat voice" , "Single unvarying note" , "Utterance at a single unvaried level" , "Dull delivery" .)

I've seen this clue in The Globe and Mail.
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