Crossword Genius

Unrealistic expectation of high tea? (3,2,3,3)

Ross

I believe the answer is:

pie in the sky

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

This clue might be a double definition.

'unrealistic expectation' is the first definition.
The definition suggests a singular noun which matches the answer.

'high tea?' is the second definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'of' is the link.

Can you help me to learn more?

(Other definitions for pie in the sky that I've seen before include "Something that's desirable but not likely to happen" , "False optimism" , "Dream" , "Misleading promise" , "Jam tomorrow" .)

I've seen this clue in The Guardian.
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