Competent to join a section of company (5)
I believe the answer is:
adept
'competent' is the definition.
(synonyms)
'join a section of company' is the wordplay.
'join' says to put letters next to each other.
'section of company' becomes 'dept' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a' next to 'dept' is 'ADEPT'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for adept that I've seen before include "who gets the lapis philosophicus secret" , "Very skilled/proficient" , "One highly skilled could be taped" , "Having the required skills" , "Taped (anag.)" .)