Something supplied for eyesight (9)

I believe the answer is:

provision

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

'for eyesight' is the wordplay.
'for' becomes 'pro' (I've seen this before).
'eyesight' becomes 'vision' (I've seen this before).
'pro'+'vision'='PROVISION'

(Other definitions for provision that I've seen before include "Keep supplied" , "Supply; condition" , "Catering" , "facilities" , "Something supplied" .)

I've seen this clue in The Telegraph.

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