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Lover lost a million in test (4)

Ross

I believe the answer is:

exam

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

'test' is the definition.
(synonyms)

'lover lost a million' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
'million' could be 'm' (abbreviation) and 'm' is located in the answer.
The remaining letters 'ex' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for exam that I've seen before include "Test (abbr)" , "paper" , "Written test" , "Important test" , "Formal knowledge test" .)

I've seen this clue in The Sun.
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