In position for the occasion (8)

I believe the answer is:

instance

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

'in position' is the wordplay.
'position' becomes 'stance' (stance is a kind of position).
'in'+'stance'='INSTANCE'

'for the' is the link.

(Other definitions for instance that I've seen before include "An insect (anag.)" , "Case in point" , "Canniest (anag) - occurrence" , "Particular example" , "Exemplify" .)

I've seen this clue in the Evening Standard.

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