Crossword Genius

This will show warmth? I’m suppressing most of triumphant comment (8)

Ross

I believe the answer is:

isotherm

I'm a little stuck... Click here to teach me more about this clue!

'triumphant comment' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'this will show warmth? i'm suppressing most of' is the wordplay.
I cannot quite understand how this works, but
'show' could be 'er' (US medical drama) and 'er' is present in the answer.
'i'm' could be 'i' (I've seen this in other clues) and 'i' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for isotherm that I've seen before include "meteorological line" , "Line joining equally hot spots" , "that's charted to a degree" , "Map line connecting places with same temperature" , "Map line of constant temperature" .)

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