One living in hope as I tip most haphazardly (8)
I believe the answer is:
optimist
'one living in hope' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'i tip most haphazardly' is the wordplay.
'haphazardly' indicates anagramming the letters.
'i'+'tip'+'most'='itipmost'
'itipmost' with letters rearranged gives 'OPTIMIST'.
'as' is the link.
Can you help me to learn more?
(Other definitions for optimist that I've seen before include "One who always looks on the bright side" , "One always believes the glass is half-full" , "cheerful type" , "One who always looks on the positive side" , "I hope for the best" .)