Crossword Genius

Strays kept in pounds in Surbiton (4)

Ross

I believe the answer is:

sins

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

'strays' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how they can define each other.

'kept in pounds in surbiton' is the wordplay.
'kept in' indicates a hidden word.
'SINS' is hidden in the letters of 'pounds in surbiton'.

Can you help me to learn more?

(Other definitions for sins that I've seen before include "Transgresses" , "Evils" , "Wrongdoings" , "Moral lapses" , "Breaches of moral law" .)

I've seen this clue in The Sun.
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