Smelled onions and weed regularly (5)
I believe the answer is:
nosed
'smelled' is the definition.
(nosing is a kind of smelling)
'onions and weed regularly' is the wordplay.
'onions' becomes 'nos' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'weed' are 'ed'.
'nos'+'ed'='NOSED'
Can you help me to learn more?
(Other definitions for nosed that I've seen before include "Pried" , "Beginner" , "edged out" , "Eased" , "Nodes (anag.)" .)