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100 per cent of B and A, perhaps, but not L (6)

Ross

I think it could be either:

better

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

'l' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for better that I've seen before include "Top" , "Preferable" , "More acceptable" , "More competent - gambler" , "layer" .)

I've seen this clue in The Sunday Times and The Times.
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