Crossword Genius

Gets Holly back into shape by cutting back on the Chardonnay? (6)

Ross

I believe the answer is:

pruner

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pruner that I've seen before include "He reduces growth" , "One cutting off" , "Clipper" , "One trimming shrub" .)

I've seen this clue in the Irish Times.
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