Looks round about — not a pretty sight (7)
I believe the answer is:
eyesore
'not a pretty sight' is the definition.
'looks round about' is the wordplay.
'looks' becomes 'eyes' (eyeing is a kind of looking).
'round' becomes 'o' (round can mean a round object).
'about' becomes 're' (common abbreviation for 'with reference to').
'eyes'+'o'+'re'='EYESORE'
(Other definitions for eyesore that I've seen before include "Ugly and offensive sight" , "Something ugly to look at" , "pigsty" , "ugly feature" , "Blight" .)