Secure Yank, loud redneck sort (5,4,3,3)

I believe the answer is:

under lock and key

'secure' is the definition.
(I've seen this in another clue)

'yank loud redneck sort' is the wordplay.
'sort' indicates an anagram.
'yank'+'loud'+'redneck'='yankloudredneck'
'yankloudredneck' anagrammed gives 'UNDER LOCK AND KEY'.

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

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app