Lines on the skin - wrinkles (7)

I believe the answer is:

furrows

'wrinkles' is the definition.
('furrow' can be a synonym of 'wrinkle')

'lines on the skin' is the wordplay.
'lines' becomes 'rows' (row is a kind of line**).
'on' says to put letters next to each other.
'the skin' becomes 'fur' (fur is a kind of skin).
'rows' put after 'fur' is 'FURROWS'.

I've seen this clue in The Telegraph.

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