Water infused with two vitamins taken everyday at the start is sufficient (8)
I believe the answer is:
adequate
'sufficient' is the definition.
(similar in meaning)
'water infused with two vitamins taken everyday at the start' is the wordplay.
'water' becomes 'aqua' (I've seen this in another clue).
'infused with' means one lot of letters goes inside another.
'two vitamins' becomes 'de' (I am not sure about this - if you are sure you should believe this answer much more).
'at the start' indicates taking the first letters.
The first letters of 'taken everyday' is 'te'.
'aqua' placed around 'de' is 'adequa'.
'adequa'+'te'='ADEQUATE'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for adequate that I've seen before include "Good or plentiful enough" , "Ample" , "Enough to meet a purpose" , "Sufficient, good enough" , "Passable but not great" .)