Crossword Genius

Being arrested, knight became ill (6)

Ross

I believe the answer is:

nailed

'being arrested' is the definition.
(I've seen this before)

'knight became ill' is the wordplay.
'knight' becomes 'N' (abbreviation for knight in chess).
'became ill' becomes 'ailed' (ail can mean to sicken).
'n'+'ailed'='NAILED'

(Other definitions for nailed that I've seen before include "not allowed to escape?" , "Fixed with a spike" , "Fixed with a pin" , "Fastened with metal pins" , "Fastened with metal pin" .)

I've seen this clue in The Telegraph.
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