All in the mind (13)

I believe the answer is:

psychosomatic

(Other definitions for psychosomatic that I've seen before include "Showing effect of mind over matter" , "(Of physical illness) caused by mental factors" , "Illustrative of 'mind over matter'" , "Relating to the interaction of mind and body" , "(Of bodily disorders) associated with the mind" .)

I've seen this clue in The Guardian.

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