Crossword Genius

Celebrity passes what sounds like ambulance during a limo trip (3,7,6,5)

Ross

I believe the answer is:

sic transit gloria mundi

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

'celebrity passes' is the definition.
(Latin phrase meaning fame is short-lived)

'what sounds like ambulance during a limo trip' is the wordplay.
I cannot really understand how this works, but
'like' could be 'sic' (I've seen this before) and 'sic' is located in the answer.
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for sic transit gloria mundi that I've seen before include "Latin magnificence fades" , "classically, her fame already forgotten" .)

I've seen this clue in The Guardian.
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