Ecologically OK on the golf course? (5)
I believe the answer is:
green
'golf course?' is the definition.
(thesaurus)
'ecologically ok on' is the wordplay.
I cannot really see how this works, but
'on' could be 're' (regarding) and 're' is present in the answer.
The remaining letters 'gen' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for green that I've seen before include "cheap marijuana" , "Between blue and yellow in the colour spectrum" , "one of eighteen" , "Eg, avocado, emerald" , "Politician perhaps" .)