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A pet enters perhaps, and goes right in (10)

Ross

I believe the answer is:

penetrates

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

'goes right in' 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.

'a pet enters perhaps' is the wordplay.
'perhaps' indicates an anagram.
'a'+'pet'+'enters'='apetenters'
'apetenters' anagrammed gives 'PENETRATES'.

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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