Old company head’s aloof manner (7)
I believe the answer is:
iciness
'aloof manner' is the definition.
'iciness' can be an answer for 'manner' (I have seen 'unfriendly manner' mean 'iciness' so perhaps 'manner' could also mean 'iciness'). I'm not certain of the 'aloof' bit.
'old company head's' is the wordplay.
'old company' becomes 'ici' (former company Imperial Chemical Industries).
'head' becomes 'ness' (ness is a headland).
'ici'+'ness'='ICINESS'
Can you help me to learn more?
(Other definitions for iciness that I've seen before include "Extreme cold" , "Hostile or cold nature" , "Frigidity" , "Extreme hostility" , "Unapproachability" .)