Crossword Genius

Atomic fire-starter in Zoroastrian writings? (6)

Ross

I believe the answer is:

avesta

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

'zoroastrian writings?' is the definition.
(I've seen this before)

'atomic fire-starter' is the wordplay.
I cannot quite see how this works, but
'atomic' could be 'a' (eg in A-test, atomic test) and 'a' is located in the answer.
The remaining letters 'vesta' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

(Other definitions for avesta that I've seen before include "collection of sacred writings" , "Zoroastrian scriptures" , "collection of holy writings" , "Zoroastrian sacred writings" , "holy scriptures" .)

I've seen this clue in The Independent.
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