Fashionable mobile is not in service (8)

I believe the answer is:

inactive

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

'fashionable mobile' is the wordplay.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'mobile' becomes 'active' (I've seen this before).
'in'+'active'='INACTIVE'

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(Other definitions for inactive that I've seen before include "Lifeless" , "Not moving/working" , "Quiescent" , "Passive, not working or in motion" , "Immobile, not working" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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