I run over returning guy, perhaps predetermined? (11)

I believe the answer is:

irrevocable

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'predetermined?' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'i run over returning guy' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'returning' says the letters should be written in reverse.
'guy' becomes 'cable' (I've seen this in another clue).
'over' backwards is 'revo'.
'i'+'r'+'revo'+'cable'='IRREVOCABLE'

'perhaps' is the link.

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I've seen this clue in The Times.

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