Title boxing aristocrat coveted (7)
I believe the answer is:
desired
'coveted' is the definition.
(synonyms)
'title boxing aristocrat' is the wordplay.
'title' becomes 'deed' (synonyms).
'boxing' means one lot of letters goes inside another ('box' can mean contain, as in to put in a box).
'aristocrat' becomes 'Sir' (Sir is an example).
'deed' going around 'sir' is 'DESIRED'.
(Other definitions for desired that I've seen before include "Lusted-after" , "Wanted strongly" , "Craved" , "Sought after" , "Had aspired to" .)