Tedious academic quick to belt out Latin (6)

I believe the answer is:

dreary

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'tedious' is the definition.
(synonyms)

'academic quick to belt out latin' is the wordplay.
I cannot really understand how this works, but
'academic' could be 'dr' and 'dr' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for dreary that I've seen before include "Overcast" , "Cheerless and depressing" , "Dismal, funereal" , "Dark" , "routine" .)

I've seen this clue in The Independent.

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