Crossword Genius

Feeling of chilliness initially from repellant assistant (5)

Ross

I believe the answer is:

rigor

I'm a little stuck... Click here to teach me more about this clue!

'feeling of chilliness' is the definition.
'rigor' can be an answer for 'chilliness' (thesaurus). I am not sure about the 'feeling of' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rigor that I've seen before include "showing failure to respond" , "Shivering chill before fever" , "Muscular cramp" , "Stiffness (after death?)" , "Chilled shivering often a symptom of disease" .)

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