Rather lovely (6)
I believe the answer is:
pretty
This clue is a double definition.
'rather' is the first definition.
(synonyms)
'lovely' is the second definition.
(I've seen this before)
(Other definitions for pretty that I've seen before include "Pleasing to look at" , "Fairly; appealing" , "See 19" , "Nice to look at" , "sweet" .)