Quite right, with swimmer losing head (6)

I believe the answer is:

rather

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'quite' is the definition.
(synonyms)

'right with swimmer losing head' is the wordplay.
'right with' becomes 'r' (common abbreviation. I am not sure about the 'with' bit.).
'swimmer' becomes 'bather' (synonyms).
'losing head' means to remove the first letter.
'bather' with its first letter removed is 'ather'.
'r'+'ather'='RATHER'

Can you help me to learn more?

(Other definitions for rather that I've seen before include "Quite; on the contrary" , "Yes, please!" , "Somewhat; more willingly" , "To a limited degree" , "somewhat > sooner? > Quite" .)

I've seen this clue in The Telegraph.

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