Crossword Genius

It is customary to cook a halibut (8)

Ross

I believe the answer is:

habitual

'it is customary' is the definition.
(synonyms)

'cook a halibut' is the wordplay.
'cook' indicates an anagram.
'a'+'halibut'='ahalibut'
'ahalibut' anagrammed gives 'HABITUAL'.

'to' is the link.

(Other definitions for habitual that I've seen before include "Chronic" , "Traditional" , "Done regularly and repeatedly" , "Customary, regular" , "Commonly practised" .)

I've seen this clue in The Guardian.
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