Putting a coat on - it’s getting very cold (5)
I believe the answer is:
icing
'putting' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for icing that I've seen before include "Cake topper" , "Topping in a bag" , "piece of cake?" , "You could see this on a cake" , "causes trouble at airports?" .)