Crossword Genius

Doth a warm heart melt? (4)

Ross

I believe the answer is:

thaw

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

'melt?' is the definition.
(I know that melt can be written as thaw)

'doth a warm heart' is the wordplay.
'THAW' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for thaw that I've seen before include "What - melt like snow?" , "spring weather?" , "John, once regularly on TV" , "Player of detective" , "end of the winter?" .)

I've seen this clue in the Sydney Morning Herald.
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