City plan mostly awful, as usual (7)
I believe the answer is:
typical
'usual' is the definition.
(thesaurus)
'city plan mostly awful' is the wordplay.
'mostly' means to remove the last letter.
'awful' indicates anagramming the letters.
'city'+'plan'='cityplan'
'cityplan' with its last letter taken off is 'citypla'.
'citypla' anagrammed gives 'TYPICAL'.
'as' is the link.
(Other definitions for typical that I've seen before include "Having the essential characteristics of a group" , "Average" , "Characteristic (of someone/something)" , "Normal" , "Characteristic, usual" .)