Support judges? Not in the government (9)

I believe the answer is:

backbench

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'not in the government' is the definition.
I can't tell whether this defines the answer.

'support judges?' is the wordplay.
'support' becomes 'back' (to back is to support or endorse).
'judges?' becomes 'bench' (name for a judge's seat, or for judges themselves).
'back'+'bench'='BACKBENCH'

Can you help me to learn more?

(Other definitions for backbench that I've seen before include "(Of MP) not holding office" , "Like MP, but not minister" , "no place for minister" .)

I've seen this clue in The Daily Express.

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