17 down
Flat
joke
on
broken
truce
(8)
Flat joke on broken truce (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Flat — think flat tyre. You've got PUN (joke) out front, then "broken" signals an anagram of TRUCE, which scrambles into CTURE, and the two parts slot together nicely.