Master switch for the current (6)

I believe the answer is:

stream

'the current' is the definition.
('stream' can be a synonym of 'current')

'master switch' is the wordplay.
'switch' indicates an anagram.
'master' with letters rearranged gives 'STREAM'.

'for' acts as a link.

(Other definitions for stream that I've seen before include "Small narrow flow" , "group of schoolchildren" , "One small river" , "Natural body of running water" , "Constant flow of liquid" .)

I've seen this clue in The Guardian, The Irish Independent, the Evening Standard, The Irish News and The Globe and Mail.

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