Lovely unruly fight: very good boxing contest in the end (11)
I believe the answer is:
scrumptious
'lovely' is the definition.
(scrumptious can mean lovely or attractive)
'unruly fight very good boxing contest in the end' is the wordplay.
'unruly fight' becomes 'scrum' (scrum can mean a crowd or fight).
'very good' becomes 'pious' (pious can mean very religious).
'boxing' means one lot of letters goes inside another ('box' can mean contain, as in to put in a box).
'in the end' suggests the final letters.
The last letter of 'contest' is 't'.
'pious' going around 't' is 'ptious'.
'scrum'+'ptious'='SCRUMPTIOUS'
(Other definitions for scrumptious that I've seen before include "Toothsome" , "Yummy" , "Extremely appetising (colloq.)" , "very good" , "Extremely delicious" .)