Trim hose fitting on hotline to weatherman? (8)
I believe the answer is:
isotherm
'hotline to weatherman?' is the definition.
I can't judge whether this defines the answer.
'trim hose fitting' is the wordplay.
'fitting' indicates anagramming the letters (letters fit or arranged differently).
'trim'+'hose'='trimhose'
'trimhose' anagrammed gives 'ISOTHERM'.
'on' is the link.
Can you help me to learn more?
(Other definitions for isotherm that I've seen before include "that's charted to a degree" , "Map line of constant temperature" , "Map line connecting places with same temperature" , "Contour line of equal temperature" , "Weather map may show that" .)