Take tea, perhaps, without your sweetener (5)
I believe the answer is:
syrup
'sweetener' is the definition.
(syrup is a kind of sweetener)
'take tea perhaps without your' is the wordplay.
'take tea perhaps' becomes 'sup' (I am not sure about this - if you are sure you should believe this answer much more).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'your' becomes 'yr'.
'sup' going around 'yr' is 'SYRUP'.
Can you help me to learn more?
(Other definitions for syrup that I've seen before include "See 12" , "rug?" , "Thick sweet sticky liquid" , "Sugary substance" , "Treacle" .)