I'll represent head of faculty on stage to provide clarity (10)

I believe the answer is:

legibility

'clarity' is the definition.
(legibility is a kind of clarity)

'i'll represent head of faculty on stage' is the wordplay.
I cannot really understand how this works, but
'on' could be 'leg' (cricket term, fielding positions) and 'leg' is present in the answer.
This may be the basis of clue (or it may be nonsense).

'to provide' acts as a link.

(Another definition for legibility that I've seen is " benefit of a steady hand".)

I've seen this clue in The Times.

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