Article run in magazine that provides useful explanations (8)
I believe the answer is:
glossary
'article run in magazine that provides useful explanations' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'article run in magazine' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'run' becomes 'r' (cricket abbreviation).
'in' indicates putting letters inside.
'magazine' becomes 'glossy' (I've seen this before).
'a'+'r'='ar'
'ar' inserted into 'glossy' is 'GLOSSARY'.
Can you help me to learn more?
(Other definitions for glossary that I've seen before include "A grossly distorted list of special words and definitions" , "List of terms text uses" , "Specialised dictionary" , "List of words with meanings" , "Explanatory list of terms" .)