Firmly attached with molten alloy (5)
I believe the answer is:
loyal
'firmly attached' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives can sometimes define each other.
'molten alloy' is the wordplay.
'molten' indicates anagramming the letters (I've seen this in other clues).
'alloy' anagrammed gives 'LOYAL'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for loyal that I've seen before include "Faithful (in allegiance)" , "Faithful - true" , "Showing firm allegiance" , "Dedicated" , "Showing enduring firm support" .)