It's odd to have tea, so they say, using only half a potful, though it's hardly noteworthy (10)
I believe the answer is:
uneventful
'it's hardly noteworthy' is the definition.
I can't tell whether this definition defines the answer.
'it's odd to have tea so they say using only half a potful' is the wordplay.
'it's odd' becomes 'uneven' (odd rather than even).
'to have' says to put letters next to each other.
'so they say' indicates a 'sounds like' (homophone) clue.
'using' is a charade indicator (letters next to each other).
'only half' indicates taking half.
'tea' is a homophone of 't'.
'potful' halved is 'ful'.
'uneven'+'t'+'ful'='UNEVENTFUL'
'though' acts as a link.
Can you help me to learn more?
(Other definitions for uneventful that I've seen before include "Quiet" , "without much happening" , "without incident" , "dull" .)