Omits tip about happy person (8)
I believe the answer is:
optimist
'happy person' is the definition.
'optimist' can be an answer for 'person' (optimist is a kind of person). I am not sure about the 'happy' bit.
'omits tip about' is the wordplay.
'about' indicates an anagram.
'omits'+'tip'='omitstip'
'omitstip' anagrammed gives 'OPTIMIST'.
Can you help me to learn more?
(Other definitions for optimist that I've seen before include "I expect more?" , "One hopeful and confident about the future" , "Someone with a bright and hopeful nature" , "I hope for the best" , "Glass-half-full person" .)