Site manager detailed ineffective medication (8)

I believe the answer is:

placebos

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'site manager detailed ineffective medication' is the definition.
I can't tell whether this definition defines the answer.

'site manager detailed' is the wordplay.
'site' becomes 'place' (synonyms).
'manager' becomes 'boss' (I've seen this in another clue).
'detailed' means to remove the last letter (the tail of the word is removed).
'boss' with its final letter removed is 'bos'.
'place'+'bos'='PLACEBOS'

Can you help me to learn more?

(Other definitions for placebos that I've seen before include "Physically inactive medicines" , "Useless drugs" , "Blase cop offering dummy cures" , "Medications with no medicinal content" , "Inert medications, given in drug trials" .)

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