Giving tip, diner incredibly brave (8)
I believe the answer is:
intrepid
'brave' is the definition.
(I know that brave can be written as intrepid)
'giving tip diner incredibly' is the wordplay.
'giving' means one lot of letters go next to another.
'incredibly' indicates anagramming the letters.
'tip' next to 'diner' is 'tipdiner'.
'tipdiner' anagrammed gives 'INTREPID'.
(Other definitions for intrepid that I've seen before include "I printed this way, being daring" , "Undaunted" , "Fearlessly adventurous" , "Afraid not" , "stout" .)