Crossword Genius

Do cursory alteration to trousers (9)

Ross

I believe the answer is:

corduroys

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

'to trousers' is the definition.
(corduroys is a kind of trousers)

'do cursory alteration' is the wordplay.
'do cursory' can be anagrammed to 'CORDUROYS'.
Though, I am not clear how this is indicated.

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 Guardian.
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