Crossword Genius

Thought processes lead to salt, perhaps, being replaced by bit of relish (9)

Ross

I believe the answer is:

reasoning

'thought processes' is the definition.
(someone's reasoning is their thought process)

I cannot understand how the remainder of the clue works.

(Other definitions for reasoning that I've seen before include "Logic" , "Train of thought" , "argument" , "Thinking that is coherent and logical" , "Debating" .)

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