Hideous aspect now seen from penthouse window? (9)
I believe the answer is:
'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).
'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" .)