Crossword Genius

A blowout for a seafarer, as a rule? (5)

Ross

I believe the answer is:

habit

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'a rule?' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for habit that I've seen before include "Breaking this is hard" , "Custom; clothing" , "Custom; riding dress" , "Monk's garb" , "Settled tendency" .)

I've seen this clue in the Evening Standard.
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