Crossword Genius

On which a crazy fool has a right to lie? (5)

Ross

I believe the answer is:

floor

I'm a little stuck... Click here to teach me more about this clue!

'a right to lie?' is the definition.
I can't judge whether this defines the answer.

'on which a crazy fool' is the wordplay.
'on' is a charade indicator (letters next to each other).
'which' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'a crazy' indicates anagramming the letters.
'fool' with letters rearranged gives 'floo'.
'r' put after 'floo' is 'FLOOR'.

'has' acts as a link.

Can you help me to learn more?

(Other definitions for floor that I've seen before include "Puzzle" , "Lower limit" , "Bottom surface" , "Knock down with force" , "Baffle, confound" .)

I've seen this clue in the Evening Standard.
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