Crossword Genius

Doubt regarding Federer's first shot? (7)

Ross

I believe the answer is:

reserve

'doubt' is the definition.
(both can mean a feeling of hesitancy)

'regarding federer's first shot?' is the wordplay.
'regarding' becomes 'Re'.
'federer's first shot?' becomes 'serve' (shot in tennis - Roger Federer is a tennis player).
're'+'serve'='RESERVE'

(Other definitions for reserve that I've seen before include "some distance" , "put to one side" , "keep for oneself" , "Keep back - book" , "Husband - substitute" .)

I've seen this clue in The Telegraph.
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