Crossword Genius

Complaint in court? (6,5)

Ross

I believe the answer is:

tennis elbow

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

'complaint' is the definition.
(I've seen this before)

'court?' is the wordplay.
I cannot really understand how this works, but
'court?' could be 'tennis' (tennis court is a kind of court) and 'tennis' is present in the answer.
The remaining letters 'elbow' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for tennis elbow that I've seen before include "problem for person serving" , "Muscular injury from exercise" , "Joint inflammation" , "Painful condition" , "Tendon problem" .)

I've seen this clue in The Mirror.
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