Crossword Genius

Lunatic I cannot restrain (7)

Ross

I believe the answer is:

contain

'restrain' is the definition.
('contain' can be a synonym of 'restrain')

'lunatic i cannot' is the wordplay.
'lunatic' indicates anagramming the letters.
'i'+'cannot'='icannot'
'icannot' with letters rearranged gives 'CONTAIN'.

(Other definitions for contain that I've seen before include "Keep within limits or have within" , "Include - restrict" , "Accommodate" , "Keep the lid on" , "keep within bounds" .)

I've seen this clue in The Telegraph.
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