To lust about anything in Yorkshire is unsophisticated (3-4)
I believe the answer is:
low-tech
'unsophisticated' is the definition.
'to lust about anything in yorkshire' is the wordplay.
'to lust' becomes 'lech'.
'about' indicates putting letters inside.
'anything in yorkshire' becomes 'owt' (I've seen this before).
'lech' placed around 'owt' is 'LOW-TECH'.
'is' is the link.
(Other definitions for low-tech that I've seen before include "Using only basic 1 down 16 down" , "Using basic hardware" , "Simple, unsophisticated" .)