Silver down at melting point? (5)

I believe the answer is:

aglow

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'melting point?' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'silver down' is the wordplay.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'down' becomes 'low' (similar in meaning).
'ag'+'low'='AGLOW'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for aglow that I've seen before include "Lit up" , "Incandescent" , "Smouldering" , "Illuminated" , "On fire" .)

I've seen this clue in The Globe and Mail.

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