For Gaul, e.g., an unusual method of communication (8)
I believe the answer is:
language
'communication' is the definition.
(I know that language is a type of communication)
'for gaul e g an unusual method' is the wordplay.
'gaul e g an' can be anagrammed to 'LANGUAGE'.
But, I'm not clear how this is indicated.
'of' is the link.
Can you help me to learn more?
(Other definitions for language that I've seen before include "speech?" , "Eg, English" , "Eg, French, German" , "Polish" , "Tongue" .)