Innocuous, not at all alluring but not cold (8)
I believe the answer is:
harmless
'innocuous' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for harmless that I've seen before include "Not producing any toxic effects" , "Not posing any danger" , "Completely safe" , "Innocuous, innocent" , "Causing no damage" .)