11 across
Conceder,
person
out
to
establish
agreement
(14)
Conceder, person out to establish agreement (14)
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The definition is at the end of the clue.
How the clue works
Look at agreement at the end — that's your definition, correspondence in the sense of matching or accord. The word "out" is your anagram indicator, so take Conceder person and jumble those letters up, and they rearrange neatly into CORRESPONDENCE.