Catch traitor first in slum building (7)
I believe the answer is:
rattrap
'slum building' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'catch traitor first' is the wordplay.
'catch' becomes 'trap' (trapping is a kind of catching).
'traitor' becomes 'rat' (I've seen this before).
'first' means one lot of letters go next to another.
'trap' put after 'rat' is 'RATTRAP'.
'in' is the link.
Can you help me to learn more?
(Other definitions for rattrap that I've seen before include "Difficult situation" , "Agreeable; Mediterranean resort" , "Means of catching rodent" , "Rodent snare" , "Rodent catcher - found on a bicycle!" .)