Most cracked crackpot concealing iffiness occasionally (8)

I believe the answer is:

daffiest

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'most cracked' is the definition.
Both the answer and definition are superlative adjectives.
Perhaps they are linked in a way I don't understand?

'crackpot concealing iffiness occasionally' is the wordplay.
'crackpot' becomes 'daft' (I can't justify this - if you can you should give a lot more credence to this answer).
'concealing' is an insertion indicator.
'occasionally' indicates alternate letters.
The alternating letters of 'iffiness' are 'fies'.
'daft' enclosing 'fies' is 'DAFFIEST'.

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I've seen this clue in The Telegraph.

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