Use a spoon back in the bunker, it seems (4)
I believe the answer is:
stir
'use a spoon' is the definition.
(I've seen this in another clue)
'back in the bunker it seems' is the wordplay.
'back' is a reversal indicator.
'in' indicates the answer is hidden within the clue.
'rits' is hidden in the letters of 'bunker it seems'.
'rits' written backwards gives 'STIR'.
(Other definitions for stir that I've seen before include "song and dance" , "Start to move" , "Move around and mix thoroughly" , "Get moving" , "riot" .)