Ascent transformed attitude (6)
I believe the answer is:
stance
'attitude' is the definition.
(stance is a kind of attitude)
'ascent transformed' is the wordplay.
'transformed' indicates anagramming the letters.
'ascent' with letters rearranged gives 'STANCE'.
(Other definitions for stance that I've seen before include "policy" , "Attitude on the tee?" , "driver preparing to strike" , "Enacts (anag)" , "Attitude - taken by a golfer?" .)