Crossword Genius

Invoice from one academic or another? (3-5)

Ross

I believe the answer is:

pro-forma

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

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

'from one academic or another?' is the wordplay.
I cannot quite see how this works, but
an anagram of 'from' is 'form' which is located in the answer.
'one' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'another?' could be 'r' (I've seen this in other clues) and 'r' is present in the answer.
The remaining letters 'pa' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

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