Crossword Genius

Ecologists on course (6)

Ross

I believe the answer is:

greens

I'm a little stuck... Click here to teach me more about this clue!

'ecologists on course' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'on course' is the wordplay.
I cannot quite understand how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is present in the answer.
'course' could be 's' and 's' is present in the answer.
The remaining letters 'gen' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for greens that I've seen before include "Vegetables (found on golf courses?)" , "Places for bowling" , "food" , "Cabbage, sprouts etc" , "Money" .)

I've seen this clue in The Globe and Mail.
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