Crossword Genius

Mouse-catchers coming up short in Sparta (5)

Ross

I believe the answer is:

traps

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

'mouse-catchers coming up' is the definition.
I can't tell whether this definition defines the answer.

'in sparta' is the wordplay.
'TRAPS' is hidden back-to-front within the letters.
However, I am unsure how this is indicated.

'short' is the link.

Can you help me to learn more?

(Other definitions for traps that I've seen before include "Devices to catch, animals say" , "Catches" , "tricks" , "The pitfalls" , "bunkers" .)

I've seen this clue in The Sun.
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