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Queen, regularly uneasy, thrilling as knights sought the Grail? (10)

Ross

I believe the answer is:

questingly

'as knights sought the grail?' is the definition.
(Arthurian knights sought the Holy Grail as a quest)

'queen regularly uneasy thrilling' is the wordplay.
'queen' becomes 'q' (abbreviation used in chess).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'thrilling' becomes 'tingly'.
The alternating letters of 'uneasy' are 'ues'.
'q'+'ues'+'tingly'='QUESTINGLY'

I've seen this clue in The Times.
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