Call about nothing unusual in the district (5)
I believe the answer is:
local
'district' is the definition.
(similar in meaning)
'call about nothing unusual' is the wordplay.
'about' means one lot of letters go next to another.
'nothing' becomes 'O' (looks like zero - 0).
'unusual' indicates anagramming the letters.
'call' after 'o' is 'ocall'.
'ocall' anagrammed gives 'LOCAL'.
'in the' is the link.
(Other definitions for local that I've seen before include "Regional; a pub" , "In the vicinity" , "One's nearest pub" , "Village inn" , "stopping train" .)