13 down
Paul
S’s
partner
in
Paris
to
go
over
unknown
site
with
a
collection?
(3,7)
Paul S’s partner in Paris to go over unknown site with a collection? (3,7)
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The definition is at the end of the clue.
How the clue works
site with a collection is the definition for an art gallery. Build it up from ART G (Art Garfunkel, the singing partner of Paul Simon), then ALLER (French for "to go", the "in Paris" tipping you off to use French), and finally Y standing for an unknown quantity.