Pie-maker about to be put in jail (5)
I believe the answer is:
pecan
'pie-maker' is the definition.
(as in a pecan pie)
'about to be put in jail' is the wordplay.
'about to' becomes 'ca' (I've seen this in other clues).
'be put in' indicates putting letters inside.
'jail' becomes 'pen' (both can mean to imprison).
'ca' placed into 'pen' is 'PECAN'.
(Other definitions for pecan that I've seen before include "Type of nut" , "Species of hickory - edible nut" , "Nut with sweet oily kernel" , "Smooth pinkish-brown nut, nice in pie" , "Nut tree of the southern United States and Mexico" .)