Quit when Dolce (or Gabbana) swapped ends (8)
I believe the answer is:
resigned
'gabbana swapped ends' is the definition.
I can't judge whether this definition defines the answer.
'quit when dolce' is the wordplay.
'quit' becomes 'resign' (resigning is a kind of quiting).
'when' becomes 'e' (I've seen this in other clues).
'dolce' becomes 'd' (this could be a standard abbreviation of which I'm unaware).
'resign'+'e'+'d'='RESIGNED'
'or' is the link.
(Other definitions for resigned that I've seen before include "Calmly submissive" , "Left work" , "Gave up (job) voluntarily" , "quietly submissive" , "Tolerating" .)