Flying kites filled with writing material - most abnormal (8)

I believe the answer is:

kinkiest

'most abnormal' is the definition.
(kinky can mean abnormal or unconventional)

'flying kites filled with writing material' is the wordplay.
'flying' is an anagram indicator (letters fly around into new positions).
'filled with' means one lot of letters goes inside another.
'writing material' becomes 'ink' (substance for writing with).
'kites' with letters rearranged gives 'kiest'.
'kiest' placed around 'ink' is 'KINKIEST'.

I've seen this clue in The Independent.

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