They show current dilettantes to an audience (8)

I believe the answer is:

ammeters

'they show current' is the definition.
(devices measuring electrical current)

'dilettantes to an audience' is the wordplay.
'dilettantes' becomes 'amateurs' (a dilettante is an amateur or dabbler).
'to an audience' indicates a 'sounds like' (homophone) clue (how it might sound to an audience).
'amateurs' is a homophone of 'AMMETERS'.

(Another definition for ammeters that I've seen is " Instruments that measure electric currents".)

I've seen this clue in The Independent.

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