Grotesque building I recognised in broadcast (7)
I believe the answer is:
eyesore
'grotesque building' is the definition.
(eyesore can mean an ugly building)
'i recognised in broadcast' is the wordplay.
'i' becomes 'eye' (I've seen this in other clues).
'recognised' becomes 'saw'.
'in broadcast' indicates a 'sounds like' (homophone) clue.
'saw' sounds like 'sore'.
'eye'+'sore'='EYESORE'
(Other definitions for eyesore that I've seen before include "Monstrosity" , "mess" , "Ugly object, hard on the sight" , "A monstrous carbuncle" , "something one wouldn't want to see" .)