Share the rent (5)
I believe the answer is:
split
I believe this clue is a double definition.
'share' is the first definition.
(split can mean someone's share of something)
'rent' is the second definition.
(rent can mean split or torn)
'the' is the link.
(Other definitions for split that I've seen before include "Riven; schism" , "Break; fissure" , "Divide - Croatian port" , "Adriatic port" , "somewhere on the Adriatic?" .)