Chill with chemical industry head (7)
I believe the answer is:
iciness
'chill' is the definition.
(I know that chill can be written as iciness)
'chemical industry head' is the wordplay.
'chemical industry' becomes 'ici' (I am not sure about this - if you are sure you should believe this answer much more).
'head' becomes 'ness' (ness is a headland).
'ici'+'ness'='ICINESS'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for iciness that I've seen before include "Chill; reserve" , "Frozen state of" , "Unapproachability" , "unfriendly manner" , "Hostility, unfriendliness" .)