Cheap transport primarily unrestricted in western city (8)
I believe the answer is:
twopenny
'cheap' is the definition.
('twopenny' can be similar in meaning to 'cheap')
'transport primarily unrestricted in western city' is the wordplay.
'primarily' suggests taking the first letters.
'unrestricted' becomes 'open' ('open' can be similar in meaning to 'unrestricted').
'in' indicates putting letters inside.
'western' becomes 'w'.
'city' becomes 'ny' (I've seen this in other clues**).
The initial letter of 'transport' is 't'.
'w'+'ny'='wny'
'open' placed within 'wny' is 'wopenny'.
't'+'wopenny'='TWOPENNY'
(Other definitions for twopenny that I've seen before include "Cheap, worthless" , "vulgar" .)