Crossword Genius

Stuffy claim made at art opening, regarding Botticelli's work? (9)

Ross

I believe the answer is:

primavera

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

'art opening regarding botticelli's work?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'stuffy claim made' is the wordplay.
'stuffy' becomes 'prim' (I've seen this in another clue).
'claim' becomes 'aver' (aver means to state or claim something).
'made' becomes 'a' (I can't justify this - if you can you should believe this answer much more).
'prim'+'aver'+'a'='PRIMAVERA'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for primavera that I've seen before include "picture of Botticelli" , "graceful painting" , "Botticelli painting" .)

I've seen this clue in The Irish Times.
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