Crossword Genius

Copper swell is isolated! (3,3)

Ross

I believe the answer is:

cut off

'is isolated' is the definition.
(thesaurus)

'copper swell' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'swell' becomes 'toff' (wealthy or high-class person).
'cu'+'toff'='CUT-OFF'

(Other definitions for cut off that I've seen before include "Device for interrupting a power supply" , "Leave nothing to in will - not a penny" , "Device for interrupting flow" , "Point after which something is no longer effective" , "disconnection?" .)

I've seen this clue in the Sydney Morning Herald.
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