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Luminary's current disadvantage (4)

Ross

I believe the answer is:

icon

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'luminary's' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'current disadvantage' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'disadvantage' becomes 'con' (as in pros and cons).
'i'+'con'='ICON'

Can you help me to learn more?

(Other definitions for icon that I've seen before include "Something on computer screen" , "Something revered" , "Sprites" , "Admired figure" , "Representative symbol, may be on computer screen" .)

I've seen this clue in The Telegraph.
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