Crossword Genius

To deceive Oliver would be rash (9)

Ross

I believe the answer is:

foolhardy

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

'rash' is the definition.
(I know that rash can be written as foolhardy)

'to deceive oliver' is the wordplay.
'to deceive' becomes 'fool' (fooling is a kind of deceiving).
'oliver' becomes 'hardy' (I can't justify this - if you can you should believe this answer much more).
'fool'+'hardy'='FOOLHARDY'

'would be' is the link.

Can you help me to learn more?

(Other definitions for foolhardy that I've seen before include "daredevil" , "Reckless" , "Impulsive" , "Dry loofah for quality of rashness" , "Rash - incautious" .)

I've seen this clue in the Evening Standard.
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