Poor feast seats one in celebration (6)

I believe the answer is:

fiesta

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'celebration' is the definition.
(fiesta is a kind of celebration)

'poor feast seats one in' is the wordplay.
'poor' indicates an anagram.
'seats one' becomes 'i' (I am not sure about this - if you are sure you should believe this answer much more).
'in' means one lot of letters goes inside another.
'feast' is an anagram of 'festa'.
'festa' going around 'i' is 'FIESTA'.

Can you help me to learn more?

(Other definitions for fiesta that I've seen before include "A public holiday in Barcelona" , "Saint's day; carnival" , "Festivity, celebration" , "(Iberian) religious holiday" , "Festival, fete" .)

I've seen this clue in The Sun.

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