A part of a company, very skilful (5)

I believe the answer is:

adept

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'skilful' is the definition.
(synonyms)

'a part of a company' is the wordplay.
'part of a company' becomes 'dept' (I can't explain this - if you can you should believe this answer much more).
'a'+'dept'='ADEPT'

'very' is the link.

Can you help me to learn more?

(Other definitions for adept that I've seen before include "Skilful, expert" , "who gets the lapis philosophicus secret" , "Very skilled person" , "clever" , "Showing skill or aptitude" .)

I've seen this clue in The Telegraph.

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