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In
a
row
preserving
alliance
is
concerning
high-ranking
politician
(10)
In a row preserving alliance is concerning high-ranking politician (10)
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The definition is at the end of the clue.
How the clue works
The definition is concerning high-ranking politician, since "senatorial" means relating to a senator. For the wordplay, take SERIAL ("in a row") and have it preserve NATO ("alliance") inside it, so NATO sits within SERIAL, splitting it into SE and RIAL. The little word "is" just links the two halves.