Tea half stewed is somewhat modest (6)
I believe the answer is:
chaste
'modest' is the definition.
(I've seen this before)
'tea half stewed' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'half' means to take half the letters.
'stewed' halved is 'ste'.
'cha'+'ste'='CHASTE'
'is somewhat' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for chaste that I've seen before include "Continent" , "not spotted at all" , "Everlasting" , "He-cats could be virtuous, strangely" , "Maiden" .)