Crossword Genius

Pro bono clinic offers sandwiches on the turn (1,1,1)

Ross

I believe the answer is:

f o c

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'pro bono' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'clinic offers sandwiches on the turn' is the wordplay.
'sandwiches' indicates a hidden word (the answer is sandwiched in by the clue).
'on the turn' says the letters should be written in reverse.
'cof' can be found hidden inside 'clinic offers'.
'cof' reversed gives 'F O C'.

Can you help me to learn more?

I've seen this clue in The Independent.
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