About to score and sample once more (5)
I believe the answer is:
retry
'sample once more' is the definition.
('try' can be a synonym for 'sample' so perhaps 'retry' is OK for 'sample once more')
'about to score' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'to score' becomes 'try' ().
're'+'try'='RETRY'
'and' is the link.
(Other definitions for retry that I've seen before include "take second opinion on case" , "Put on trial again" , "Hear (a case) again" , "Make a further attempt" , "Have another go" .)