One receiving assurances school dance is essentially cheery (8)

I believe the answer is:

promisee

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'one receiving assurances school' is the definition.
The definition suggests a singular noun which matches the answer.

'dance is essentially cheery' is the wordplay.
'dance' becomes 'prom' (prom is a kind of dance).
'essentially' indicates the central letters.
The middle letters of 'cheery' are 'ee'.
'prom'+'is'+'ee'='PROMISEE'

Can you help me to learn more?

(Other definitions for promisee that I've seen before include "One guaranteed" , "One's received pledge" .)

I've seen this clue in The Guardian.

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