Pointer’s good in Scotland and English border (9)
I believe the answer is:
guideline
'pointer's' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'good in scotland and english border' is the wordplay.
'good in scotland' becomes 'guid' (Scottish version of 'good').
'and' is a charade indicator (letters next to each other).
'english' becomes 'e' (abbreviation).
'border' becomes 'line'.
'guid'+'e'+'line'='GUIDELINE'
Can you help me to learn more?
(Other definitions for guideline that I've seen before include "General piece of advice" , "Directing rule or principle" , "Rule of thumb -- need Luigi (anag)" , "Advice on general policy" , "General item of advice" .)