How to serve toast say in bed (8)

I believe the answer is:

buttered

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'how to serve toast' is the definition.
I can't tell whether this defines the answer.

'say in bed' is the wordplay.
'say' becomes 'utter' (to utter something is to speak or say it).
'in' means one lot of letters goes inside another.
'utter' put within 'bed' is 'BUTTERED'.

Can you help me to learn more?

(Another definition for buttered that I've seen is " Covered with dairy spread".)

I've seen this clue in The Globe and Mail.

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