Seer angry in hideous building (7)
I believe the answer is:
eyesore
'hideous building' is the definition.
(I've seen this before)
'seer angry' is the wordplay.
'seer' becomes 'eye' (I can't justify this - if you can you should give a lot more credence to this answer).
'angry' becomes 'sore' (similar in meaning).
'eye'+'sore'='EYESORE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for eyesore that I've seen before include "Monstrosity" , "terrible prospect" , "Something exceedingly ugly" , "bad sight" , "Ugly sight, not nice to see" .)