Crossword Genius

Well-known saint in here, working with domestic pet? (9)

Ross

I believe the answer is:

catherine

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

'well-known saint' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'in here working with domestic pet?' is the wordplay.
'working' indicates anagramming the letters.
'with' means one lot of letters goes inside another.
'domestic pet?' becomes 'cat' ().
'in'+'here'='inhere'
'inhere' anagrammed gives 'herine'.
'herine' going around 'cat' is 'CATHERINE'.

Can you help me to learn more?

(Other definitions for catherine that I've seen before include "Name of three wives of Henry VIII" , "-- Parr; -- wheel" , "Girl's name - kind of wheel" , "A - wheel is a firework" , "woman" .)

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