Watchers maybe down at the bingo hall (4)
I believe the answer is:
eyes
'watchers' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for eyes that I've seen before include "Organs of vision" , "Narrowly observes" , "(Paradoxical?) film with Cruise and Kidman" , "The first things children open on Christmas Day" , "Potato seed-buds" .)