Crossword Genius

Castle requiring a single key (7)

Ross

I believe the answer is:

arundel

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

'a single key' is the wordplay.
'single' becomes 'run' (cricket).
'key' becomes 'del' (del key on a keyboard).
'a'+'run'+'del'='ARUNDEL'

'requiring' acts as a link.

(Other definitions for arundel that I've seen before include "Castle in W. Sussex" , "West Sussex town with a castle" , "Norfolk seat" , "English public school" , "somewhere in W Sussex" .)

I've seen this clue in The Times.
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