Hideous aspect now seen from penthouse window? (9)
I believe the answer is:
townscape
'seen from penthouse window?' is the definition.
(I've seen this before)
'hideous aspect now' is the wordplay.
'hideous' indicates an anagram (I've seen this in other clues).
'aspect'+'now'='aspectnow'
'aspectnow' with letters rearranged gives 'TOWNSCAPE'.
(Other definitions for townscape that I've seen before include "seen from penthouse window?" , "sight of built-up area" , "Picture of borough" .)