Crossword Genius

Fit Latin insertion into two articles on Mark, when ending's scrapped (8)

Ross

I believe the answer is:

athletic

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

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

'latin insertion into two articles on mark when ending's scrapped' is the wordplay.
I cannot quite see how this works, but
'latin' could be 'l' and 'l' is found within the answer.
'articles' could be 'athe' ('a' and 'the', indefinite and definite articles) and 'athe' is present in the remaining letters.
The remaining letters 'tic' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for athletic that I've seen before include "Powerful" , "Given to partaking in sporting events" , "Fit and sporty" , "Sporty, able-bodied" , "Lithe act (anag)" .)

I've seen this clue in The Guardian.
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