Gives advantage to some participants in doubles session (7)

I believe the answer is:

blesses

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'gives advantage to' is the definition.
I can't tell whether this definition defines the answer.

'participants in doubles session' is the wordplay.
'participants in' indicates a hidden word.
'BLESSES' can be found hidden inside 'doubles session'.

'some' acts as a link.

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I've seen this clue in The Independent.

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