Crossword Genius

One who wears religious garb and tends to follow a fixed routine? (8,2,5)

Ross

I believe the answer is:

creature of habit

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

'one who wears religious garb and tends to follow' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'a fixed routine?' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
'routine?' could be 'habit' (I've seen this before) and 'habit' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for creature of habit that I've seen is " one who's predictable?".)

I've seen this clue in The Irish Times.
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