Check alien permit (6)

I believe the answer is:

ticket

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

'permit' is the definition.
(I've seen this before)

'check alien' is the wordplay.
'check' becomes 'tick' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'alien' becomes 'et' (extra terrestrial).
'tick'+'et'='TICKET'

Can you help me to learn more?

(Other definitions for ticket that I've seen before include "Buy one for admittance" , "Slip showing payment of fee or fare" , "Slip to show payment of entrance fee" , "set of policies in US elections" , "Admission card" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.