Liner last to be wrecked by placer (9)

I believe the answer is:

installer

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'placer' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'liner last to be wrecked' is the wordplay.
'to be wrecked' is an anagram indicator.
'liner'+'last'='linerlast'
'linerlast' is an anagram of 'INSTALLER'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for installer that I've seen before include "fitter" , "New software program" .)

I've seen this clue in the Sydney Morning Herald.

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