Sugary beer started out ambiguous (11)
I believe the answer is:
bittersweet
'sugary' is the definition.
(thesaurus)
'beer started out ambiguous' is the wordplay.
'beer' becomes 'bitter' (bitter is a type of beer).
'started' says to put letters next to each other.
'out ambiguous' becomes 'sweet' (I can't justify this - if you can you should believe this answer much more).
'bitter'+'sweet'='BITTERSWEET'
Can you help me to learn more?
(Other definitions for bittersweet that I've seen before include "Mixing pleasure and pain" , "Evoking both pleasure and pain" , "arousing mixed feelings" , "Arousing pleasure tinged with pain" , "At once pleasurable and painful" .)