She may nurse religiously (6)

I believe the answer is:

sister

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

'nurse religiously' is the definition.
'sister' can be an answer for 'nurse' (a female nurse might be called sister). I am unsure of the 'religiously' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sister that I've seen before include "Tender" , "twin?" , "woman in hospital" , "of the same origin" , "Martin --, film director" .)

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