Master reorganised pupils’ group (6)

I believe the answer is:

stream

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'pupils' group' is the definition.
'stream' can be an answer for 'group' (stream is a kind of group). I am not sure about the 'pupils'' bit.

'master reorganised' is the wordplay.
'reorganised' is an anagram indicator.
'master' with letters rearranged gives 'STREAM'.

Can you help me to learn more?

(Other definitions for stream that I've seen before include "comprising a load of drips?" , "Transmit music or video online" , "Torrent" , "'Brook, runnel (6)'" , "'Current, flow (6)'" .)

I've seen this clue in The Times.

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