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But a greyhound can get out of it (4)

Ross

I believe the answer is:

trap

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

'out of it' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trap that I've seen before include "Snare; light carriage" , "Hook" , "Light horse-drawn carriage" , "Confine" , "Means of transport (sometime sprung!)" .)

I've seen this clue in the Evening Standard.
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