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In film, lost climbing team should make admission (9)

Ross

I believe the answer is:

enrolment

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

'in film' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'lost climbing team should make admission' is the wordplay.
I cannot really understand how this works, but
'lost' could be 'l' (abbreviation in sporting league tables) and 'l' is located in the answer.
'team' could be 'men' (group of people) and 'men' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for enrolment that I've seen before include "signing up" , "Joining" , "Act of entering on a list of members" , "matriculation" , "Registration" .)

I've seen this clue in The Independent.
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