Crossword Genius

Poor little creature! (6,5)

Ross

I believe the answer is:

church mouse

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

'little creature' is the definition.
(I know that church mouse is a fictional animal)

I don't understand the rest of the clue.

Can you help me to learn more?

I've seen this clue in The Irish News.
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