One of the farm’s adjuncts that remains always the same? (6)

I believe the answer is:

stable

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'one of the farm's adjuncts that remains always the same?' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

This is all the clue.

Can you help me to learn more?

(Other definitions for stable that I've seen before include "Products all from same place" , "providing accommodation for Arabs, perhaps" , "Firmly-fixed; building" , "Horse establishment" , "Fixed; stud building" .)

I've seen this clue in the Evening Standard.

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