Very small piece of cloth turns into fruitcake in illusion (6)
I believe the answer is:
minute
'very small' is the definition.
(minute can mean tiny)
'piece of cloth turns into fruitcake in illusion' is the wordplay.
I cannot quite understand how this works, but
'piece' could be 'nut' (nut is a kind of piece) and 'nut' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for minute that I've seen before include "Sixty seconds" , "Barely perceptible" , "Exact" , "Immeasurably small" , "Very short or tiny" .)