Crossword Genius

High-class medic in Nigerian city dismissing son’s back pain (7)

Ross

I believe the answer is:

lumbago

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

'back pain' is the definition.
(I've seen this in another clue)

'high-class medic in nigerian city dismissing son's' is the wordplay.
I cannot really understand how this works, but
'medic' could be 'mb' (Bachelor of Medicine) and 'mb' is present in the answer.
'high class' could be 'u' (as in U and non-U speech) and 'u' is present in the answer.
'city' could be 'la' (Los Angeles) and 'la' is found within the leftover letters.
The remaining letters 'go' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lumbago that I've seen before include "Pain -- a bum log (anag)" , "Maul bog badly for a rheumatic affliction" , "Rheumatism of lower back" , "Rheumatic backache" , "Back affliction" .)

I've seen this clue in The Times.
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