False alarm by one eastern or western city (7)
I believe the answer is:
laramie
'western city' is the definition.
The definition suggests a singular noun which matches the answer.
'false alarm by one eastern' is the wordplay.
'false' indicates anagramming the letters.
'by' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'eastern' becomes 'e'.
'alarm' is an anagram of 'laram'.
'laram'+'i'+'e'='LARAMIE'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for laramie that I've seen before include "US town" , "Wyoming city" , "in America" , "Town in Wyoming" , "Wyoming place" .)