Bell-bottoms (6)
I believe the answer is:
flares
'bell-bottoms' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for flares that I've seen before include "Wide-bottomed trousers" , "Blazes of light" , "Trousers with legs widening at the bottom" , "Devices producing bright lights as signal" , "Sudden brief bursts of bright light" .)