Crossword Genius

Keep copyright with least trouble (6)

Ross

I believe the answer is:

castle

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

'copyright with least trouble' is the wordplay.
'copyright' becomes 'c' (as in the copyright symbol, a C in a circle).
'with' means one lot of letters go next to another.
'trouble' is an anagram indicator.
'least' anagrammed gives 'astle'.
'c'+'astle'='CASTLE'

(Other definitions for castle that I've seen before include "ancient building?" , "a piece in the corner" , "Chess piece and grand house" , "making a move" , "Man on board" .)

I've seen this clue in The Globe and Mail.
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