Undesirable people (8)

I think it could be either:

Which length description are you looking for?:

4-4

riffraff

'undesirable people' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for riffraff that I've seen before include "Crowd regarded with disdain" , "Dregs of society" , "Rubbish" , "Rabble, crowd of unruly people" , "Disreputable people, rabble" .)

I've seen this clue in The Guardian.

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