Scare companion sick (5)

I believe the answer is:

chill

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'scare companion sick' is the definition.
The answer and definition can be both feelings as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'companion sick' is the wordplay.
'companion' becomes 'ch' (Companion of Honour).
'sick' becomes 'ill' (synonyms).
'ch'+'ill'='CHILL'

Can you help me to learn more?

(Other definitions for chill that I've seen before include "Make cold; relax" , "Sensation of cold or dread" , "Preserve by cold" , "Make cooler" , "This disheartens" .)

I've seen this clue in The Telegraph.

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