Do a stretch keeping such a house (4)
I believe the answer is:
oast
'such a house' is the definition.
(oast houses are used in brewing)
'do a stretch keeping' is the wordplay.
'keeping' indicates the answer is hidden within the clue.
'OAST' can be found hidden inside 'do a stretch'.
(Other definitions for oast that I've seen before include "Hop-drier" , "Hop-drying kiln" , "Cooker" , "Oven for hops" , "Hop-kiln" .)