Arguably a kangaroo rat (7)

I believe the answer is:

bounder

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'rat' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for bounder that I've seen before include "Untrustworthy type (once)" , "The skipper" , "A hop-along cad?" , "Dishonourable man (dated colloq.)" , "A cad - or a kind of jumper" .)

I've seen this clue in The Times.

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