Crossword Genius

Flashing light set or not, beep occurring intermittently (6)

Ross

I believe the answer is:

strobe

'flashing light' is the definition.
(I've seen this before)

'set or not beep occurring intermittently' is the wordplay.
'occurring intermittently' indicates alternate letters.
'set'+'or'+'not'+'beep'='setornotbeep'
The alternating letters of 'setornotbeep' are 'STROBE'.

(Other definitions for strobe that I've seen before include "Flashing disco light" , "High-intensity flashing beam of light" , "Flash on and off" , "Sister to Hansel" , "Flashing lamp" .)

I've seen this clue in The Telegraph.
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