Sore about a bachelor being drab (6)

I believe the answer is:

sombre

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'drab' is the definition.
(I know that drab can be written as sombre)

'sore about a bachelor' is the wordplay.
'about' indicates putting letters inside.
'a bachelor' becomes 'mb' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sore' going around 'mb' is 'SOMBRE'.

'being' is the link.

Can you help me to learn more?

(Other definitions for sombre that I've seen before include "Dark, dull" , "Funereal" , "Gloomy and dismal" , "Grave and serious" , "Melancholy" .)

I've seen this clue in the Evening Standard.

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