Crossword Genius

Crumble one type of bread (4)

Ross

I believe the answer is:

roti

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'type of bread' is the definition.
'roti' can be an answer for 'bread' (roti is a type of bread). I'm unsure of the 'type of' bit.

'crumble one' is the wordplay.
'crumble' becomes 'rot' (I've seen this in another clue).
'one' becomes 'i' (Roman numeral).
'rot'+'i'='ROTI'

Can you help me to learn more?

(Other definitions for roti that I've seen before include "Indian bread (not naan)" , "Indian bread cooked on a griddle" , "Indian flatbread" , "Indian flat round bread" , "spicy sandwich" .)

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