Flasher at disco? (6)
I believe the answer is:
strobe
This clue could be a double definition.
'flasher' is the first definition.
(I've seen this before)
'disco?' is the second definition.
Both the answer and definition are singular nouns.
Perhaps there's an association between them I don't understand?
'at' is the link.
Can you help me to learn more?
(Other definitions for strobe that I've seen before include "Protestant reformer" , "Light that seems to spin" , "Flashing-light device" , "Flashing, very bright beam" , "Sorbet (anag) -flashing light" .)