Show an inclination to be generous (3)
I believe the answer is:
tip
'show an' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tip that I've seen before include "offered at end of repast" , "Useful hint; end" , "Small amount" , "Warning" , "Pointed extremity" .)