One judge is far from happy (5)

I believe the answer is:

irate

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'far from happy' is the definition.
I can't judge whether this defines the answer.

'one judge' is the wordplay.
'one' becomes 'I' (Roman numeral).
'judge' becomes 'rate' (rating is a kind of judging).
'i'+'rate'='IRATE'

'is' is the link.

Can you help me to learn more?

(Other definitions for irate that I've seen before include "ranting" , "Angry, enraged" , "Ticked off" , "Annoyed, irritated" , "Wrathful" .)

I've seen this clue in The Guardian.

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