Popular attribute covers key difference (10)

I believe the answer is:

inequality

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

'difference' is the definition.
(inequality is a kind of difference)

'popular attribute' is the wordplay.
'popular' becomes 'in'.
'attribute' becomes 'equality' (equality is a kind of attribute**).
'in'+'equality'='INEQUALITY'

'covers key' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Another definition for inequality that I've seen is " Disparity".)

I've seen this clue in The Telegraph.

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