Crossword Genius

Little sucker's obsession with the environment (8)

Ross

I believe the answer is:

greenbug

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

'the environment' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'little sucker's obsession' is the wordplay.
I cannot quite see how this works, but
'obsession' could be 'bug' and 'bug' is found within the answer.
The remaining letters 'green' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

'with' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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