Master switch for the current (6)

I believe the answer is:

stream

'current' is the definition.
(synonyms)

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

'for the' 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 Evening Standard, The Irish News, The Globe and Mail, The Guardian and The Irish Independent.

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