Pet store thief? (10)

I believe the answer is:

catburglar

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

'thief?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'pet store' is the wordplay.
'pet' becomes 'cat' (cats are often kept as pets).
'store' becomes 'burglar' (I am not sure about this - if you are sure you should believe this answer much more).
'cat'+'burglar'='CATBURGLAR'

Can you help me to learn more?

(Another definition for catburglar that I've seen is " Criminal".)

I've seen this clue in The Daily Express.

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