Spike one member's beer (6)
I believe the answer is:
impale
'spike' is the definition.
('impale' can be a synonym of 'spike')
'one member's beer' is the wordplay.
'one member' becomes 'imp' (I've seen this in other clues**).
'beer' becomes 'ale' (I've seen this before).
'imp'+'ale'='IMPALE'
(Other definitions for impale that I've seen before include "Pierce, me pail (anag.)" , "Spike" , "Fix as on a sharp stick" , "Pierce, run through" , "transfix with sharp item" .)