Frightful house - I'd move (7)
I believe the answer is:
hideous
'frightful' is the definition.
(I've seen this before)
'house i'd move' is the wordplay.
'move' indicates an anagram.
'house'+'id'='houseid'
'houseid' with letters rearranged gives 'HIDEOUS'.
(Other definitions for hideous that I've seen before include "Extremely unpleasant" , "Unsightly" , "Ghastly" , "Horrible" , "Frightful" .)