Do cursory pants or jeans, say (9)

I believe the answer is:

corduroys

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

'do cursory pants' is the wordplay.
'pants' is an anagram indicator (UK informal term for 'nonsense' or 'rubbish').
'do'+'cursory'='docursory'
'docursory' is an anagram of 'CORDUROYS'.

'or' acts as a link.

Can you help me to learn more?

(Another definition for corduroys that I've seen is " Trousers of ribbed cotton fabric".)

I've seen this clue in The Hindu.

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