Genuine crustless bread on plate (4)
I believe the answer is:
real
'genuine' is the definition.
(I know that genuine can be written as real)
'crustless bread on plate' is the wordplay.
'crustless bread' becomes 'rea' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'plate' becomes 'l' (from the L-plate that Learner drivers use).
'rea'+'l'='REAL'
Can you help me to learn more?
(Other definitions for real that I've seen before include "---- Madrid, Spanish football club" , "Actual; Brazilian currency" , "Pukka" , "Certainly no counterfeit" , "Genuine or existing" .)