Addle-pated dab hand (5)
I believe the answer is:
adept
'dab hand' is the definition.
'adept' can be an answer for 'dab' (thesaurus). I am not sure about the 'hand' bit.
'addle-pated' is the wordplay.
'pated' anagrams to 'ADEPT'.
Though, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for adept that I've seen before include "Deacon" , "Taped (anag.)" , "Practised" , "who gets the lapis philosophicus secret" , "Having the required skills" .)