Wrong letters delivered to spy? (5)
I believe the answer is:
typos
'wrong letters' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe there's an association between them I don't understand?
'delivered to spy?' is the wordplay.
'to spy' anagrams to 'TYPOS'.
But, I'm not clear how this is indicated.
Can you help me to learn more?
(Other definitions for typos that I've seen before include "Printing errors" , "Mistakes" .)