Parking all wrong around ancient city - more than one (6)
I believe the answer is:
plural
'more than one' is the definition.
(grammar)
'parking all wrong around ancient city' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'wrong' indicates anagramming the letters.
'around' indicates putting letters inside.
'ancient city' becomes 'ur' (ancient Sumerian city state).
'all' with letters rearranged gives 'lal'.
'lal' placed around 'ur' is 'lural'.
'p'+'lural'='PLURAL'
(Other definitions for plural that I've seen before include "Word usually ending in 's'" , "More than onefold" , "Denotes more than one" , "More than one, not singular" , "More than one in number" .)