Occasionally bonus to be available for result (7)

I believe the answer is:

outcome

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'available for result' is the definition.
'outcome' can be an answer for 'result' (I know this). I'm not sure about the 'available for' bit.

'occasionally bonus to be' is the wordplay.
'occasionally' indicates alternate letters.
'be' becomes 'come' (coming is a kind of being).
'bonus'+'to'='bonusto'
The alternating letters of 'bonusto' are 'out'.
'out'+'come'='OUTCOME'

Can you help me to learn more?

(Other definitions for outcome that I've seen before include "answer" , "End result" , "'Result, upshot (7)'" , "Consequence, upshot" , "Consequence, effect" .)

I've seen this clue in The Independent.

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