Crossword Genius

Putting a coat on - it’s getting very cold (5)

Ross

I believe the answer is:

icing

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'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.

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(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?" .)

I've seen this clue in the Evening Standard.
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