Equality to observe in a fire-worshipper (6)

I believe the answer is:

parsee

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'a fire-worshipper' is the definition.
I can't tell whether this defines the answer.

'equality to observe' is the wordplay.
'equality' becomes 'par' (synonyms).
'to observe' becomes 'see' (I've seen this before).
'par'+'see'='PARSEE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for parsee that I've seen before include "A spree, strangely, following Prophet Zoroaster" , "Zoroastrian descendant" , "Adherent of a Zoroastrian sect - a spree (anag)" , "Religious believer" , "Follower of a pre-Islamic religion - sea rep (anag)" .)

I've seen this clue in The Globe and Mail.

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