Flag or sail hung awry (8)
I believe the answer is:
languish
'flag' is the definition.
(I've seen this before)
'sail hung awry' is the wordplay.
'awry' indicates anagramming the letters.
'sail'+'hung'='sailhung'
'sailhung' with letters rearranged gives 'LANGUISH'.
'or' acts as a link.
(Other definitions for languish that I've seen before include "Long" , "Become discouraged" , "Droop" , "Lose or lack vitality" , "Haul sign away - lack vitality" .)