Crossword Genius

Sufficient number barely realising what follows what comes next? (4)

Ross

I believe the answer is:

lent

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lent that I've seen before include "Provided loans" , "Gave the use of for a time" , "Forty days of fasting" , "days before Easter" , "Advanced" .)

I've seen this clue in The Telegraph.
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