Brewed last tea, if nothing else (2,5)
I believe the answer is:
at least
'if nothing else' is the definition.
(I've seen this before)
'brewed last tea' is the wordplay.
'brewed' is an anagram indicator.
'last'+'tea'='lasttea'
'lasttea' with letters rearranged gives 'AT LEAST'.
(Other definitions for at least that I've seen before include "No less than" , "Anyway" , "however" , "'If nothing else (2,5)'" , "Eat salt (anag) - if nothing else" .)