Crossword Genius

Paid cabby on the regular to wait in lobby, who enjoyed himself greatly (3,1,4)

Ross

I believe the answer is:

had a ball

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

'paid cabby on the regular to wait in lobby' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'enjoyed himself greatly' is the wordplay.
I cannot really understand how this works, but
'enjoyed' could be 'had' (I've seen this in other clues) and 'had' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'who' is the link.

Can you help me to learn more?

(Other definitions for had a ball that I've seen before include "Enjoyed oneself enormously" , "raised the roof" , "were greatly entertained" .)

I've seen this clue in The Irish Times.
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