You should feel bad supporting artificial energy (3,5)

I believe the answer is:

for shame

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'you should feel bad' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'supporting artificial energy' is the wordplay.
'supporting' becomes 'for' (being for something means supporting it).
'artificial energy' becomes 'shame' (I am not sure about this - if you are sure you should believe this answer much more).
'for'+'shame'='FOR SHAME'

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I've seen this clue in The Guardian.

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