Crossword Genius

Cranky duke, led on, wrongly imprisoned (5,4,3,3)

Ross

I believe the answer is:

under lock and key

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

'cranky duke led on wrongly' is the wordplay.
'wrongly' indicates an anagram.
'cranky'+'duke'+'led'+'on'='crankydukeledon'
'crankydukeledon' is an anagram of 'UNDER LOCK AND KEY'.

(Another definition for under lock and key that I've seen is " Imprisoned".)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app