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In the navy, a sound crew with faultless service (7)

Ross

I believe the answer is:

cruiser

I'm a little stuck... Click here to teach me more about this clue!

'in the navy a' is the definition.
I can't judge whether this defines the answer.

'sound crew with faultless service' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'with faultless service' becomes 'iser' (I can't justify this - if you can you should give a lot more credence to this answer).
'crew' is a homophone of 'cru'.
'cru'+'iser'='CRUISER'

Can you help me to learn more?

(Other definitions for cruiser that I've seen before include "Relatively fast warship" , "Pleasure craft" , "Old warship" , "Warship; leisure craft" , "Ship" .)

I've seen this clue in the Evening Standard.
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