Revolutionary source of light, son cries (5)

I believe the answer is:

blubs

'cries' is the definition.

'revolutionary source of light son' is the wordplay.
'revolutionary' says the letters should be written in reverse.
'source of light' becomes 'bulb'.
'son' becomes 's'.
'bulb' backwards is 'blub'.
'blub'+'s'='BLUBS'

I've seen this clue in The Times.

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