Sniff? No way! (4)
I believe the answer is:
nose
'sniff?' is the definition.
(I've seen this in another clue)
'no way' is the wordplay.
'way' becomes 'se' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'no'+'se'='NOSE'
Can you help me to learn more?
(Other definitions for nose that I've seen before include "front part of vehicle" , "Aroma of wine" , "Asian wind instrument -- use Teflon (anag)" , "Hooter" , "Front of an aircraft" .)