The blowing up of a dam? (5)
I believe the answer is:
blast
This clue might be a double definition.
'the blowing up' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'a dam?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'of' is the link.
Can you help me to learn more?
(Other definitions for blast that I've seen before include "Strong gust of air" , "Effect of explosion" , "Blow up or swear" , "Sudden strong gust of wind" , "Severe reprimand; strong gust" .)