Dull doctor: “What’s coming on Monday?” (6)

I believe the answer is:

dreary

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'dull' is the definition.
(similar in meaning)

'doctor what's coming on monday?' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'what's coming on monday?' becomes 'eary' (I can't justify this - if you can you should believe this answer much more).
'dr'+'eary'='DREARY'

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(Other definitions for dreary that I've seen before include "Bleak, depressing" , "Banal" , "Depressingly dull" , "Gloomy, boring" , "Dismal, funereal" .)

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