Liqueur with rum chaser? True (10)
I believe the answer is:
chartreuse
'liqueur' is the definition.
(Chartreuse is an example)
'rum chaser? true' is the wordplay.
'rum' indicates an anagram (rum can mean strange or unusual).
'chaser'+'true'='chasertrue'
'chasertrue' with letters rearranged gives 'CHARTREUSE'.
'with' acts as a link.
(Other definitions for chartreuse that I've seen before include "drink" , "Pale green-yellow colour" , "green liquid" , "Green-yellow liqueur" , "The spirit" .)