Turning around, stagger out to lunch (4)
I believe the answer is:
nuts
'out to lunch' is the definition.
(I've seen this before)
'turning around stagger' is the wordplay.
'turning around' shows that the letters should be reversed in order.
'stagger' becomes 'stun' (both can mean to shock).
'stun' reversed gives 'NUTS'.
(Other definitions for nuts that I've seen before include "Mad; seeds" , "Edible seeds with hard shells" , "Mad - hard fruits" , "Hard-shelled fruit" , "out to lunch" .)