While away, alcohol's something holidaymaker requires (8)
I believe the answer is:
passport
'something holidaymaker requires' is the definition.
(a holidaymaker might need a passport)
'while away alcohol's' is the wordplay.
'while away' becomes 'pass' (pass time).
'alcohol' becomes 'port' (port is a type of wine).
'pass'+'port'='PASSPORT'
(Other definitions for passport that I've seen before include "It could be important on holiday" , "Travel doc" , "Travel identification" , "Official document required for foreign travel" , "that may gain acceptance" .)