Crossword Genius

An L of a lot, possibly? (5)

Ross

I believe the answer is:

fifty

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'an l' is the definition.
(I know that l can be written as fifty)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for fifty that I've seen before include "Half-century" , "A multiple of ten" , "L" .)

I've seen this clue in the Evening Standard.
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