Shelf that is in weird placement (11)

I believe the answer is:

mantlepiece

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'shelf' is the definition.
(mantlepiece is a kind of shelf)

'that is in weird placement' is the wordplay.
I cannot really see how this works, but
'that is' could be 'ie' (synonyms) and 'ie' is located in the answer.
an anagram of 'placement' is 'mantlepce' which is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Hindu.

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