Sufficient reticence to have a chilling effect (3)
I believe the answer is:
ice
'a chilling effect' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'sufficient reticence to have' is the wordplay.
'to have' indicates the answer is hidden within the clue.
'ICE' is hidden in the letters of 'sufficient reticence'.
Can you help me to learn more?
(Other definitions for ice that I've seen before include "A state of water" , "such an age" , "Cool down" , "dessert" , "engine" .)