Chilli sauce, perhaps it's stolen (3,5)
I believe the answer is:
hot stuff
This clue is a double definition.
'chilli sauce perhaps' is the first definition.
(chilli sauce is a hot substance)
'it's stolen' is the second definition.
(stolen goods can be described as 'hot')
(Other definitions for hot stuff that I've seen before include "Something really outstanding" , "Something outstanding - vindaloo?" , "chilli powder?" , "cayenne, perhaps" , "A sensation" .)