Drapes ruined by butter, say (6)

I believe the answer is:

spread

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

'butter say' is the definition.
'spread' can be an answer for 'butter' (thesaurus). I am not sure about the 'say' bit.

'drapes ruined' is the wordplay.
'ruined' indicates anagramming the letters.
'drapes' anagrammed gives 'SPREAD'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for spread that I've seen before include "Extend - banquet" , "Diffuse" , "Expanse; edible paste" , "Special display" , "Soft paste; large meal" .)

I've seen this clue in The Mirror.

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