17 across
US
state’s
old
university
is
covered
in
creeper
(9)
US state’s old university is covered in creeper (9)
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The definition is at the beginning of the clue.
How the clue works
Right, so US state's is the definition, pointing you to Louisiana. For the wordplay, take O for "old", U for "university" and IS, and tuck that little string inside LIANA (a creeper plant) — split the creeper as L...IANA and slot O-U-IS in between, giving you L-O-U-IS-IANA.