Green mineral water taken by fool cycling? (6)
I believe the answer is:
augite
'green mineral' is the definition.
'augite' can be an answer for 'mineral' (augite is a kind of mineral). I am unsure of the 'green' bit.
'water taken by fool cycling?' is the wordplay.
I cannot quite see how this works, but
'fool' could be 'git' (both can mean an annoying person) and 'git' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for augite that I've seen is " Mineral".)