Stink inside and stink outside shoe company (6)
I believe the answer is:
reebok
'shoe company' is the definition.
The definition suggests a singular noun which matches the answer.
'stink inside and stink outside' is the wordplay.
'stink' becomes 'b' (I can't explain this - if you can you should give a lot more credence to this answer).
'inside' says to take the centre.
'and' becomes 'too'.
'stink' becomes 'reek' (synonyms).
'outside' means one lot of letters goes inside another (some letters go outside others).
The central letter of 'too' is 'o'.
'b'+'o'='bo'
'bo' going into 'reek' is 'REEBOK'.
Can you help me to learn more?
(Other definitions for reebok that I've seen before include "South African animal" , "African runner" , "South African antelope (E, not H)" , "Antelope of southern Africa" .)