Barney turned sexiest losing jacket (3-2)
I believe the answer is:
set-to
'barney' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for set-to that I've seen before include "Brief fight" , "Fight, argument" , "Scrap" , "Ready - fight" , "Altercation" .)