Crossword Genius

Type of service that's subject to writing? (9)

Ross

I believe the answer is:

underhand

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'type of service that's' is the definition.
I can't judge whether this defines the answer.

'subject to writing?' is the wordplay.
'subject to' becomes 'under' (being subject to a law is being under it).
'writing?' becomes 'hand' ('hand' can refer to someone's handwriting).
'under'+'hand'='UNDERHAND'

Can you help me to learn more?

(Other definitions for underhand that I've seen before include "done deviously through cover" , "Crafty" , "Reporting to worker" , "Deceptively" , "Surreptitiously, sounds like a lower employee" .)

I've seen this clue in The Telegraph.
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