Worrying profusely about rent? I don't care! (6,8)
I believe the answer is:
please yourself
'i don't care' is the definition.
'worrying profusely about rent?' is the wordplay.
'worrying' indicates anagramming the letters.
'about' is an insertion indicator.
'rent?' becomes 'lease' (I've seen this before).
'profusely' with letters rearranged gives 'pyourself'.
'pyourself' enclosing 'lease' is 'PLEASE YOURSELF'.
(Other definitions for please yourself that I've seen before include "don't worry about me" , "Whatever" .)