Crossword Genius

Ubiquitous old politician with grudge about Islington area (11)

Ross

I believe the answer is:

omnipresent

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'ubiquitous' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for omnipresent that I've seen before include "Everywhere at the same time" , "travelling all over the place" , "Existing everywhere" , "Encountered everywhere" , "Found everywhere" .)

I've seen this clue in The Times.
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