Carpenter's tool franchise limited to some extent (6)
I believe the answer is:
chisel
'carpenter's tool' is the definition.
(I've seen this before)
'franchise limited to some extent' is the wordplay.
'to some extent' indicates a hidden word.
'CHISEL' is hidden within 'franchise limited'.
(Other definitions for chisel that I've seen before include "Sculptor's tool" , "Tool used to shape wood, stone or metal" , "Hammered cutting tool" , "Hand tool to shape wood" , "Edge tool for the carpenter" .)