Puts up with an alternative daze (6)
I believe the answer is:
stupor
'daze' is the definition.
(synonyms)
'puts up with an alternative' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'with' is a charade indicator (letters next to each other).
'an alternative' becomes 'or'.
'puts' back-to-front is 'stup'.
'stup'+'or'='STUPOR'
(Other definitions for stupor that I've seen before include "State of bewilderment" , "State of shock" , "result of too much snow?" , "Semi-comatose state" , "Almost unconscious state" .)