Yours has the with-it lining (5)
I believe the answer is:
thine
'yours' is the definition.
(I've seen this in another clue)
'the with-it lining' is the wordplay.
'with it' becomes 'in' (both can mean trendy).
'lining' means one lot of letters goes inside another.
'the' going around 'in' is 'THINE'.
'has' acts as a link.
(Another definition for thine that I've seen is " Yours (archaic)".)
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