Quantity of tin obtained in moulded form (5)
I believe the answer is:
ingot
'quantity of tin' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'obtained in moulded form' is the wordplay.
I cannot really see how this works, but
'obtained' could be 'got' ('get' can be a synonym of 'obtain') and 'got' is present in the answer.
'in' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ingot that I've seen before include "A lump of metal, perhaps gold" , "expensive block" , "Unwrought metal cast in a mould" , "Piece of cast metal" , "Block of, eg, gold" .)