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At heart, Simon is confused about play in Dublin theatre (7)

Ross

I believe the answer is:

olympia

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

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for olympia that I've seen before include "Chief sanctuary of Zeus" , "traditional home of games" , "Capital of Washington state, and site of ancient Games" , "plain in Greece" , "Greek district" .)

I've seen this clue in The Irish Times.
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