Little house with bad mould: it's criminal (7)

I believe the answer is:

hoodlum

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'criminal' is the definition.
(hoodlum is a kind of criminal)

'little house with bad mould' is the wordplay.
'little house' becomes 'ho' (abbreviation for house. I am not sure about the 'little' bit.).
'with' means one lot of letters go next to another.
'bad' indicates anagramming the letters.
'mould' with letters rearranged gives 'odlum'.
'ho'+'odlum'='HOODLUM'

'it's' is the link.

Can you help me to learn more?

(Other definitions for hoodlum that I've seen before include "Petty gangster" , "tough!" , "Small-time criminal" , "Rowdy" , "Punk" .)

I've seen this clue in The Sun.

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