Crossword Genius

No particular one key part (3)

Ross

I believe the answer is:

any

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'no particular' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

'one key part' is the wordplay.
'one' becomes 'a'.
'key part' becomes 'ny' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'ny'='ANY'

Can you help me to learn more?

(Other definitions for any that I've seen before include "A lot < ? Not a lot < -- some" , "'Whatever'" , "One, some, every or all without specification" , "Long-running Radio 4 discussion show" , "One, no matter which" .)

I've seen this clue in the Evening Standard.
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