Alloy of lead and tin for the final stage (4-3)

I believe the answer is:

tail-end

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'the final stage' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'alloy of lead and tin' is the wordplay.
'alloy of' is an anagram indicator.
'and' says to put letters next to each other.
'lead' after 'tin' is 'tinlead'.
'tinlead' is an anagram of 'TAIL-END'.

'for' acts as a link.

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