Not being the big boss, he's addressed informally (3)

I believe the answer is:

guv

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'not being the big boss he's addressed informally' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for guv that I've seen before include "Boss (inf.)" , "Sir" .)

I've seen this clue in the Evening Standard.

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