Person staying cool thanks to ice packs (5)
I believe the answer is:
stoic
'person' is the definition.
(stoic is a kind of person)
'thanks to ice packs' is the wordplay.
'packs' indicates a hidden word (I've seen 'packing' mean this).
'STOIC' is hidden in the letters of 'thanks to ice'.
'staying cool' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for stoic that I've seen before include "Greek in school" , "Impassive type" , "One showing endurance during adversity" , "philosophical type" , "Someone seemingly indifferent to pleasure or pain" .)