Car units I'm involved in nail worker (10)

I believe the answer is:

manicurist

I'm a little stuck... Click here to teach me more about this clue!

'nail worker' is the definition.
'manicurist' can be an answer for 'worker' (manicurist is a kind of worker). I'm not certain of the 'nail' bit.

'car units i'm involved' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'car'+'units'+'im'='carunitsim'
'carunitsim' with letters rearranged gives 'MANICURIST'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for manicurist that I've seen is " pro with file?".)

I've seen this clue in The Independent.

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