A superintendent finally in position to calm down (7)
I believe the answer is:
placate
'calm down' is the definition.
(placating is a kind of calming down)
'a superintendent finally in position' is the wordplay.
'finally' indicates one should take the final letters.
'in' means one lot of letters goes inside another.
'position' becomes 'place' (synonyms).
The final letter of 'superintendent' is 't'.
'a'+'t'='at'
'at' inserted within 'place' is 'PLACATE'.
'to' acts as a link.
(Other definitions for placate that I've seen before include "'Pacify, appease (7)'" , "Make calm, conciliate" , "Mollify, calm down" , "Mollify, soothe anger" , "Calm, pacify, appease" .)