Crossword Genius

Angry religious group disowns oddly deficient representative sample (5-7)

Ross

I believe the answer is:

cross-section

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

'representative sample' is the definition.
(I've seen this before)

'angry religious group disowns oddly' is the wordplay.
'angry' becomes 'cross' (I've seen this before).
'religious group' becomes 'sect' (I've seen this before).
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternate letters of 'disowns' are 'ion'.
'cross'+'sect'+'ion'='CROSS-SECTION'

'deficient' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Guardian.
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