Common or standard weekend (4)
I believe the answer is:
park
'common' is the definition.
('park' can be a synonym of 'common')
'standard weekend' is the wordplay.
'standard' becomes 'par' (I've seen this before).
'weekend' becomes 'k' (I've seen this in other clues).
'par'+'k'='PARK'
'or' is the link.
(Other definitions for park that I've seen before include "Large public garden" , "Public open pace" , "Recreation ground" , "See 1" , "Korean surname" .)