Crossword Genius

Monastic custom? (5)

Ross

I believe the answer is:

habit

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

This clue might be a double definition.

'monastic' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'custom?' is the second definition.
(I know that habit is a type of custom)

Can you help me to learn more?

(Other definitions for habit that I've seen before include "It's second nature" , "Ingrained behaviour" , "nun gets into" , "Propensity" , "Monk's garb" .)

I've seen this clue in the Evening Standard.
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