Hide round bike sheds, primarily to smoke (7)
I believe the answer is:
obscure
'hide' is the definition.
(I know that hide can be written as obscure)
'round bike sheds primarily to smoke' is the wordplay.
'round bike' becomes 'ob' (I can't explain this - if you can you should believe this answer much more).
'primarily' says to take the initial letters.
'to smoke' becomes 'cure' (I've seen this in other clues).
The initial letter of 'sheds' is 's'.
'ob'+'s'+'cure'='OBSCURE'
(Other definitions for obscure that I've seen before include "Hazy or indistinct" , "Dim, indistinct or not well known" , "Dull, opaque" , "Blot out" , "Jude may be" .)