Crossword Genius

Flasher disturbing Isabel on beach (7,6)

Ross

I believe the answer is:

belisha beacon

I'm a little stuck... Click here to teach me more about this clue!

'flasher' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'disturbing isabel on beach' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'isabel'+'on'+'beach'='isabelonbeach'
'isabelonbeach' is an anagram of 'BELISHA BEACON'.

Can you help me to learn more?

(Other definitions for belisha beacon that I've seen before include "Flashing marker alongside1 across" , "Road crossing light" , "Zebra crossing light" , "light by the way" , "Light indicating pedestrian crossing" .)

I've seen this clue in The Irish Independent.
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