Crossword Genius

Extra large mushroom (5)

Ross

I believe the answer is:

morel

'mushroom' is the definition.
(I know that morel is a type of mushroom)

'extra large' is the wordplay.
'extra' becomes 'more' (both can mean additional).
'large' becomes 'L' (eg in clothes sizes).
'more'+'l'='MOREL'

(Other definitions for morel that I've seen before include "Edible mushroom" , "One has a cap" , "Edible fungus" , "Type of mushroom" .)

I've seen this clue in The Telegraph and The Hindu.
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