Halt ice production in a way that's proper (7)
I believe the answer is:
ethical
'that's proper' is the definition.
(I've seen this before)
'halt ice production' is the wordplay.
'production' indicates an anagram.
'halt'+'ice'='haltice'
'haltice' anagrammed gives 'ETHICAL'.
'in a way' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for ethical that I've seen before include "Morally correct, in accordance with principles" , "Relating to morals" , "Approved moral behaviour" , "At Chile (anag.)" , "Moral, principled" .)