For replacement, is antipope unsuitable? (10)

I believe the answer is:

inapposite

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'for replacement is antipope unsuitable?' is the definition.
I can't tell whether this definition defines the answer.

'is antipope unsuitable?' is the wordplay.
'unsuitable?' indicates anagramming the letters (I've seen 'unsuitable' mean this (letters not in suitable order)).
'is'+'antipope'='isantipope'
'isantipope' is an anagram of 'INAPPOSITE'.

Can you help me to learn more?

(Another definition for inapposite that I've seen is " Out of place".)

I've seen this clue in The Independent.

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