Tend to tip (7)
I believe the answer is:
incline
I believe this clue is a double definition.
'tend' is the first definition.
('incline' can be a synonym of 'tend')
'tip' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for incline that I've seen before include "tip" , "Tend - slope" , "Have tendency or slope" , "lean forward" , "bank" .)