Jack has a cold touch (5)
I believe the answer is:
frost
'a cold touch' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
'jack' is the wordplay.
I cannot really see how this works, but
'jack' could be 'os' (Ordinary Seaman - jack can mean a sailor) and 'os' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'has' acts as a link.
Can you help me to learn more?
(Other definitions for frost that I've seen before include "Ice crystals forming a white deposit" , "Frozen dew" , "Rime" , "Icy condensation" , "Ice forming in cold weather" .)