Free a number of bushrangers in Glenrowan (6)

I believe the answer is:

single

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'free a number' is the definition.
'single' can be an answer for 'free' (I've seen this before). I am not certain of the 'a number' bit.

'of bushrangers in glenrowan' is the wordplay.
'of' indicates a hidden word.
'SINGLE' can be found hidden inside 'bushrangers in glenrowan'.

Can you help me to learn more?

(Other definitions for single that I've seen before include "Unattached" , "Unaccompanied" , "One-way ticket" , "Only one; record" , "Like bachelor" .)

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

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