___ to (care for) (4)
I believe the answer is:
tend
'to care for' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tend that I've seen before include "Be predisposed, or care for" , "Look after, or take certain direction" , "Be inclined - look after" , "lean in a certain direction" , "Minister" .)