Message Peel's encrypted with it (7)

I believe the answer is:

epistle

'message' is the definition.
(I know that message can be written as epistle)

'peel's encrypted with it' is the wordplay.
'encrypted with' indicates an anagram.
'peels' mixed up with 'it' can make 'EPISTLE'.

(Other definitions for epistle that I've seen before include "Romans perhaps" , "Apostolic letter" , "Missive; letter" , "Long formal letter (found in the New Testament?)" , "A letter from St Paul" .)

I've seen this clue in The Sun.

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