Crossword Genius

Carnival with boos and cheers (6)

Ross

I believe the answer is:

fiesta

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'carnival' is the definition.
(I've seen this before)

'boos and cheers' is the wordplay.
'boos' becomes 'fies' (I can't justify this - if you can you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'cheers' becomes 'ta' (both can mean thank you).
'fies'+'ta'='FIESTA'

'with' acts as a link.

Can you help me to learn more?

(Other definitions for fiesta that I've seen before include "Religious event" , "Public celebration in Spain" , "Religious festival in Spain" , "Public whoopee in Spain" , "(Spanish) religious festival" .)

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