Where waiters are passing under bar? (5)
I believe the answer is:
limbo
This clue is a double definition.
'where waiters are' is the first definition.
(I've seen this before)
'passing under bar?' is the second definition.
(I've seen this before)
(Other definitions for limbo that I've seen before include "passing under bar?" , "Once supposed abode of the souls of unbaptized infants" , "Pole dance" , "Place of suspense" , "West Indian dance - state of uncertainty" .)