Temperature of old Peruvian container (3,3)
I believe the answer is:
tin can
'container' is the definition.
(tin can is a kind of container)
'temperature of old peruvian' is the wordplay.
I cannot really see how this works, but
'temperature' could be 't' (abbreviation) and 't' is located in the answer.
'peruvian' could be 'incan' (I have seen 'Old Peruvian ' mean 'incan' so perhaps 'peruvian' could also mean 'incan') and 'incan' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tin can that I've seen before include "container - this one?" , "Metal container" , "emptied food container" , "Means to preserve" , "vessel" .)