Happen to recall 'business' being deposited by dog (5)
I believe the answer is:
occur
'happen' is the definition.
(I know that happen is a more specific form of happen)
'recall business being deposited by dog' is the wordplay.
'recall' shows that the letters should be reversed in order.
'business' becomes 'co' (short for company).
'being deposited by' is a charade indicator (letters next to each other).
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'co' in reverse letter order is 'oc'.
'oc'+'cur'='OCCUR'
'to' acts as a link.
(Other definitions for occur that I've seen before include "Turn up" , "Come to pass" , "found" , "appear" , "Happen - to come to mind" .)