Calm down when cooking sausage (7)
I believe the answer is:
assuage
'calm down' is the definition.
(assuage can mean to calm down or relieve)
'cooking sausage' is the wordplay.
'cooking' is an anagram indicator (letters cooked up into a new form).
'sausage' with letters rearranged gives 'ASSUAGE'.
'when' is the link.
(Other definitions for assuage that I've seen before include "Satisfy (an appetite)" , "Appease, calm" , "Mollify" , "allay hunger perhaps" , "Pacify, allay" .)