Contract provided by psychiatrist (6)
I believe the answer is:
shrink
This clue is a double definition.
'contract' is the first definition.
(I know that contract is a more specific form of the action shrink)
'psychiatrist' is the second definition.
(informal term for a psychiatrist)
'provided by' acts as a link.
(Other definitions for shrink that I've seen before include "Withdraw from" , "Get less" , "Become smaller, contract" , "Grow smaller like slangy psychiatrist" , "Contract, reduce" .)