Remove organ from lounge bar for The Navy (4)
I believe the answer is:
blue
'the navy' is the definition.
(thesaurus)
'remove organ from lounge bar' is the wordplay.
'remove' indicates anagramming the letters (move the letters again).
'from' suggests deleting specific letters.
'lounge'+'bar'='loungebar'
'loungebar' with 'organ' taken out is 'lueb'.
'lueb' anagrammed gives 'BLUE'.
'for' acts as a link.
(Other definitions for blue that I've seen before include "Glum, sad" , "Tory?" , "Sea colour" , "Sky-coloured" , "Conservative > depressed" .)