Crossword Genius

A sticky attachment in a manner of speaking (4)

Ross

I believe the answer is:

burr

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This clue could be a double definition.

'a sticky attachment' is the first 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?

'manner of speaking' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'in a' is the link.

Can you help me to learn more?

(Other definitions for burr that I've seen before include "Prickly seed case - sound particular to certain dialects" , "Raymond --, 'Perry Mason' actor" , "Former US vice-president - dialect way of pronouncing R" , "Prickly seeds" , "Type of seed with short stiff bristles or hooks" .)

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