12 across
Ubiquitous
leader
is
great
alongside
fellow
union
member
(3,7)
Ubiquitous leader is great alongside fellow union member (3,7)
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The definition is at the beginning of the clue.
How the clue works
Ubiquitous leader is what we're defining here, that all-seeing figure straight out of Orwell's 1984. For the wordplay, just bolt BIG (meaning great) onto BROTHER (a fellow trade union member) and there's your answer.