Mother's upset with son beset by criticism -- drink in here? (7,5)
I believe the answer is:
thermos flask
'criticism drink in here?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'mother's upset with son beset' is the wordplay.
'upset with' is an anagram indicator.
'son' becomes 's' (genealogical abbreviation for son).
'beset' becomes 'flask' (I can't explain this - if you can you should believe this answer much more).
'mother' anagrammed with 's' can make 'thermos'.
'thermos'+'flask'='THERMOS FLASK'
'by' acts as a link.
Can you help me to learn more?
(Another definition for thermos flask that I've seen is " Container for keeping drinks hot".)