Alien captain unhappy about everyone getting promoted (6)
I believe the answer is:
dallas
'alien captain' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'unhappy about everyone getting promoted' is the wordplay.
'unhappy' becomes 'sad' (associated in meaning).
'about' indicates putting letters inside.
'everyone' becomes 'all' (all people).
'getting promoted' shows that the letters should be reversed in order (in a down clue, letters go up).
'sad' enclosing 'all' is 'sallad'.
'sallad' reversed gives 'DALLAS'.
Can you help me to learn more?
(Other definitions for dallas that I've seen before include "city built on oil" , "City where President Kennedy was assassinated" , "assassination site" , "City in Texas - all sad (anag)" , "former TV series" .)