Group supporting TT race on vacation lining field (4)

I believe the answer is:

area

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'field' is the definition.
(I know that field can be written as area)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for area that I've seen before include "District; locale" , "field of study" , "Expanse of a surface" , "Geographical region" , "part of town" .)

I've seen this clue in The Guardian.

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