Lunch held by Zoroastrians (5)
I believe the answer is:
roast
'lunch' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's a link between them I don't understand?
'held by zoroastrians' is the wordplay.
'held by' indicates a hidden word.
'ROAST' can be found hidden inside 'zoroastrians'.
Can you help me to learn more?
(Other definitions for roast that I've seen before include "Cook in oven or by exposure to heat" , "Slate" , "Carpet" , "Give a telling off to - cook" , "Cook; criticise" .)