Crossword Genius

Enclose TT pay in catch up for vehicle fines (7,7)

Ross

I believe the answer is:

penalty notices

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

'tt pay in catch up for vehicle fines' is the definition.
I know nothing about this answer so I can't tell whether this works.

'enclose' is the wordplay.
I cannot quite see how this works, but
'enclose' could be 'pen' (I've seen this in another clue) and 'pen' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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