Crossword Genius

A group of undesirables regularly goes wild (6,7)

Ross

I believe the answer is:

rogues gallery

'a group of undesirables' is the definition.
(I've seen this before)

'regularly goes wild' is the wordplay.
'wild' is an anagram indicator.
'regularly'+'goes'='regularlygoes'
'regularlygoes' anagrammed gives 'ROGUES' GALLERY'.

(Other definitions for rogues gallery that I've seen before include "Police collection of photos of known criminals" , "Collection of pictures of criminals" , "Mug collection" , "Group of undesirables" , "Group of disreputable people" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app