Pin is oval-shaped in exhibition buildings? (9)

I believe the answer is:

pavilions

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

'exhibition buildings?' is the definition.
'pavilions' can be an answer for 'buildings?' (I've seen this before). I am not sure about the 'exhibition' bit.

'pin is oval-shaped' is the wordplay.
'shaped' indicates anagramming the letters.
'pin'+'is'+'oval'='pinisoval'
'pinisoval' anagrammed gives 'PAVILIONS'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pavilions that I've seen before include "Buildings" , "Summerhouses" .)

I've seen this clue in the Sydney Morning Herald.

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