In high temperature, employs one to take care of the property (5,3)
I believe the answer is:
house sit
'take care of the property' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'in high temperature employs one' is the wordplay.
'in high' becomes 'houses' (I can't explain this - if you can you should give a lot more credence to this answer).
'temperature' becomes 't' (abbreviation).
'employs' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'houses'+'t'='housest'
'housest' placed around 'i' is 'HOUSE-SIT'.
'to' is the link.
Can you help me to learn more?
(Other definitions for house sit that I've seen before include "Look after building" , "take care of property" , "way to provide residential care?" , "take care of residence" .)