13 across
Heads
of
redbrick
universities
institute
new
standards
for
dilapidated
buildings
(5)
Heads of redbrick universities institute new standards for dilapidated buildings (5)
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The definition is at the end of the clue.
How the clue works
Look to the end — dilapidated buildings is your definition, pointing to ruins. For the wordplay, just grab the heads of "redbrick universities institute new standards" — first letter of each word gives you R, U, I, N, S, spelling it out nicely.