Tradesman has the German beer included (6)
I believe the answer is:
dealer
'tradesman' is the definition.
(I've seen this in another clue)
'the german beer included' is the wordplay.
'the german' becomes 'der' ('the' in German).
'beer' becomes 'ale' (type of beer).
'included' indicates putting letters inside.
'der' going around 'ale' is 'DEALER'.
'has' is the link.
(Other definitions for dealer that I've seen before include "Trader as on Stock Exchange" , "Stockjobber" , "Buyer and seller of goods" , "Merchant" , "Card distributor" .)