Adjust beer container to hold brewed tea? On the contrary (6)
I believe the answer is:
attune
'adjust' is the definition.
(attuning is a kind of adjusting)
'brewed tea? on the contrary' is the wordplay.
'brewed' indicates anagramming the letters.
'on' indicates putting letters inside (as in clothing \'on\' a person).
'the contrary' becomes 'tun' (I can't explain this - if you can you should believe this answer much more).
'tea' with letters rearranged gives 'ate'.
'ate' going around 'tun' is 'ATTUNE'.
'beer container to hold' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
(Other definitions for attune that I've seen before include "Bring into musical accord" , "Acclimatise" , "Harmonise or synchronise" , "Adjust (to a situation)" , "Harmonize or adapt, to matter or idea" .)