Risk having a dog at home (5)
I believe the answer is:
incur
'risk' is the definition.
(I've seen this before)
'a dog at home' is the wordplay.
'a dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'at' means one lot of letters go next to another (I've seen this in other clues).
'home' becomes 'in' (to be in is to be (at) home).
'cur' put after 'in' is 'INCUR'.
'having' acts as a link.
(Other definitions for incur that I've seen before include "Bring upon oneself - be liable for" , "Invite, bring about" , "Become liable to (costs)" , "Arouse" , "contract" .)