Quiet beer for an upright member (4)
I believe the answer is:
pale
'an upright member' is the definition.
(pale can mean a stake or post)
'quiet beer' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'beer' becomes 'ale' (type of beer).
'p'+'ale'='PALE'
'for' acts as a link.
(Other definitions for pale that I've seen before include "heraldic stripe" , "Colourless" , "Having less colour than normal" , "Not bright - limit" , "Whitish" .)