Navy arrest manual (4-6)

I believe the answer is:

blue-collar

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'manual' is the definition.
(similar in meaning)

'navy arrest' is the wordplay.
'navy' becomes 'blue' (I can't justify this - if you can you should believe this answer much more).
'arrest' becomes 'collar-' (synonyms).
'blue'+'collar'='BLUE-COLLAR'

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(Other definitions for blue-collar that I've seen before include "Relating to manual workers" , "Manual (work)" .)

I've seen this clue in the Sydney Morning Herald.

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