Mother is prepared to show the same level of warmth (8)
I believe the answer is:
isotherm
'show the same level of warmth' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'mother is prepared' is the wordplay.
'prepared' is an anagram indicator.
'mother'+'is'='motheris'
'motheris' anagrammed gives 'ISOTHERM'.
'to' is the link.
Can you help me to learn more?
(Other definitions for isotherm that I've seen before include "meteorological line" , "Map line of constant temperature" , "Weather map may show that" , "Line joining places of equal temperature" , "that's charted to a degree" .)