Letter synonymous with Paul Lee's tip off? (7)

I believe the answer is:

epistle

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

'lee's tip off?' is the wordplay.
'off?' indicates an anagram (I've seen 'off' mean this).
'lees'+'tip'='leestip'
'leestip' with letters rearranged gives 'EPISTLE'.

'synonymous with paul' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for epistle that I've seen before include "Long formal letter (found in the New Testament?)" , "Such as St Paul wrote" , "communication" , "(E.g. Paul's) letter" , "may read this" .)

I've seen this clue in The Irish Times.

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