Gathering range has a method of production (8,4)

I believe the answer is:

assembly line

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'a method of production' is the definition.
I can't judge whether this definition defines the answer.

'gathering range' is the wordplay.
'gathering' becomes 'assembly' (synonyms).
'range' becomes 'line' (I've seen this in other clues).
'assembly'+'line'='ASSEMBLY LINE'

'has' acts as a link.

Can you help me to learn more?

(Other definitions for assembly line that I've seen before include "Eg, car plant set-up" , "Factory fabrication process" , "Factory installation" , "Manufacturing set-up" , "Series of machines in factory" .)

I've seen this clue in The Daily Express.

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