Swine conceals new show of coldness (4)
I believe the answer is:
snow
'show of coldness' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
'swine conceals new' is the wordplay.
'swine' becomes 'sow' (sow is a kind of swine).
'conceals' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'sow' enclosing 'n' is 'SNOW'.
Can you help me to learn more?
(Other definitions for snow that I've seen before include "Wintry weather" , "Winter flakes" , "Wintry flakes?" , "Frozen rain" , "Settler" .)