'waste' here is used in an old legal manner as not in any man's possession - remember that the corresponding book that records the reasons for changes in Lib Assed is known as Lib Vast (book of wastes); remember also the old usage of farm - to rent out.

you must be looking at an early MR as most farm of wastes dissappers into intacks

the Bras has always slightly puzzed me - my guess is that tho nominally for brewing it was in effect an ale house licence