A scruffy old bear is lovely (8)
I believe the answer is:
adorable
'is lovely' is the definition.
(synonyms)
'a scruffy old bear' is the wordplay.
'scruffy' indicates an anagram.
'old'+'bear'='oldbear'
'oldbear' with letters rearranged gives 'dorable'.
'a'+'dorable'='ADORABLE'
(Other definitions for adorable that I've seen before include "Winsome" , "fetching" , "Cute and cuddly?" , "winning" , "worthy of love" .)