Smells not right around opening of insect repellent (6)
I believe the answer is:
odious
'repellent' is the definition.
(I've seen this before)
'smells not right around opening of insect' is the wordplay.
'smells' becomes 'odours' ('odour' can be a synonym of 'smell').
'not' suggests deleting specific letters.
'right' becomes 'r' (abbreviation).
'around' indicates putting letters inside.
'opening of insect' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'odours' with 'r' taken away is 'odous'.
'odous' placed around 'i' is 'ODIOUS'.
Can you help me to learn more?
(Other definitions for odious that I've seen before include "Disagreeable" , "Loathsome and repugnant" , "Hateful, generally despised" , "Really hateful, abhorrent" , "Abominable, detestable" .)