Crossword Genius

Keep idle cat active (7)

Ross

I believe the answer is:

citadel

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

'idle cat active' is the wordplay.
'active' indicates an anagram (the letters are active/moving).
'idle'+'cat'='idlecat'
'idlecat' anagrammed gives 'CITADEL'.

(Other definitions for citadel that I've seen before include "Stronghold (of the Salvation Army?)" , "Kremlin" , "Structure in place to protect" , "Fortress -- dialect (anag)" , "Fortress (in or near city)" .)

I've seen this clue in The Hindu.
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