Ascend Alp, with difficulty, for scenery (9)
I believe the answer is:
landscape
'for scenery' is the definition.
(landscape is a kind of scenery)
'ascend alp with difficulty' is the wordplay.
'with difficulty' indicates anagramming the letters.
'ascend'+'alp'='ascendalp'
'ascendalp' is an anagram of 'LANDSCAPE'.
(Other definitions for landscape that I've seen before include "Piece of inland scenery" , "Possible prospect" , "Broad view of scenery" , "The visible features of an area" , "Countryside for a painter" .)