Crossword Genius

Cockney building boundary round field, moving slowly? (6)

Ross

I believe the answer is:

edging

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'cockney building' 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 don't understand how the remainder of the clue works.

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(Other definitions for edging that I've seen before include "Border, fringing" , "Bordering, fringing" , "Border; moving carefully" , "Advancing sideways" , "Moving slowly sideways" .)

I've seen this clue in The Times.
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