Crossword Genius

On which lawyers are updated about extra fees? (9,6)

Ross

I believe the answer is:

refresher course

'on which lawyers are updated' is the definition.
I can't tell whether this definition defines the answer.

'about extra fees?' is the wordplay.
I cannot really understand how this works, but
'about' could be 're' (regarding) and 're' is found within the answer.
'extra' could be 'fresh' (as in 'fresh blood') and 'fresh' is located in the answer.
This may be the basis of clue (or it may be nonsense).

(Other definitions for refresher course that I've seen before include "it helps you get up to speed" , "Training" , "sweet group?" , "study update" , "further education?" .)

I've seen this clue in The Times.
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