Crossword Genius

Trained terrier, one who is out of service (7)

Ross

I believe the answer is:

retirer

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'one who is out of service' is the definition.
The definition suggests a singular noun which matches the answer.

'trained terrier' is the wordplay.
'trained' is an anagram indicator (to train can mean to grow something into a shape).
'terrier' is an anagram of 'RETIRER'.

Can you help me to learn more?

(Other definitions for retirer that I've seen before include "One going to bed" , "he goes to bed" .)

I've seen this clue in The Hindu.
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