Crossword Genius

Bill’s bearer to gain back fresh love, dizzily lying in grass? (6,8)

Ross

I believe the answer is:

window envelope

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

'bill's' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'bearer to gain back fresh love dizzily lying in grass?' is the wordplay.
I cannot quite see how this works, but
'gain' could be 'win' (synonyms) and 'win' is present in the answer.
an anagram of 'love' is 'velo' which is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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