Crossword Genius

Unconventional requital for one fourth of the population (8)

Ross

I believe the answer is:

quartile

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

'one fourth of the population' is the definition.
I can't tell whether this definition defines the answer.

'unconventional requital' is the wordplay.
'unconventional' indicates an anagram.
'requital' with letters rearranged gives 'QUARTILE'.

'for' acts as a link.

Can you help me to learn more?

(Another definition for quartile that I've seen is " A fourth part of a distribution (stats)".)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app