Molten ingot ran out of the loop (8)
I believe the answer is:
ignorant
'out of the loop' is the definition.
(I've seen this in another clue)
'molten ingot ran' is the wordplay.
'molten' indicates anagramming the letters (I've seen this in other clues).
'ingot'+'ran'='ingotran'
'ingotran' anagrammed gives 'IGNORANT'.
(Other definitions for ignorant that I've seen before include "Lacking knowledge in Tir na nOg" , "Without knowledge" , "Lacking in education" , "left in the dark" , "Unknowing" .)