Everything and nothing close to Boudicca's town (5)
I believe the answer is:
alloa
'town' is the definition.
(Scottish town)
'everything and nothing close to boudicca's' is the wordplay.
'everything' becomes 'all' (all things).
'and' is a charade indicator (letters next to each other).
'nothing' becomes 'O' (looks like zero - 0).
'close to' indicates one should take the final letters (the close/ending of).
The last letter of 'boudicca' is 'a'.
'all'+'o'+'a'='ALLOA'
(Other definitions for alloa that I've seen before include "place in Scotland" , "Scots town in the Central Lowlands" , "Central Scottish town" , "possible cup opponent" , "Town near Stirling" .)