Examine ambition in trial run (9)

I believe the answer is:

testdrive

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

'examine ambition' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'trial run' is the wordplay.
'trial' becomes 'test' (synonyms).
'run' becomes 'drive' (synonyms).
'test'+'drive'='TESTDRIVE'

'in' is the link.

Can you help me to learn more?

(Other definitions for testdrive that I've seen before include "Take one before buying a car" , "Try out (car)" , "Divert set towards examination of car performance" , "Try out a new vehicle" .)

I've seen this clue in The Daily Express.

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.