Rep I mess about in place of business? (8)
I believe the answer is:
premises
'place of business?' is the definition.
(I've seen this before)
'rep i mess about' is the wordplay.
'about' indicates an anagram.
'rep'+'i'+'mess'='repimess'
'repimess' anagrammed gives 'PREMISES'.
'in' is the link.
(Other definitions for premises that I've seen before include "Buildings occupied by businesses" , "Places of business" , "Building, place of business" , "Property" , "The aforesaid" .)