Sort of peach that's not expensive (5)
I believe the answer is:
cheap
'that's not expensive' is the definition.
('cheap' is the opposite to 'expensive')
'sort of peach' is the wordplay.
'sort of' indicates anagramming the letters.
'peach' anagrammed gives 'CHEAP'.
(Other definitions for cheap that I've seen before include "Inexpensive or tasteless" , "Economical - rubbishy" , "Second-rate" , "good value" , "Of very poor quality" .)