Crossword Genius

Mother is producing a line on a weather map (8)

Ross

I believe the answer is:

isotherm

'a line on a weather map' is the definition.
(I've seen this in another clue)

'mother is producing' is the wordplay.
'producing' is an anagram indicator.
'mother'+'is'='motheris'
'motheris' with letters rearranged gives 'ISOTHERM'.

(Other definitions for isotherm that I've seen before include "Line joining places of equal temperature" , "meteorological line" , "Contour line of equal temperature" , "Weather map may show that" , "Line of equal heat" .)

I've seen this clue in The Irish News.
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