Expert fitting round edges of doorframe (5)
I believe the answer is:
adept
'expert' is the definition.
(synonyms)
'fitting round edges of doorframe' is the wordplay.
'fitting' becomes 'apt' (I've seen this before).
'round' is an insertion indicator.
'edges of' suggests removing the centre.
'doorframe' with its middle removed is 'de'.
'apt' going around 'de' is 'ADEPT'.
(Other definitions for adept that I've seen before include "Highly proficient" , "Skillful" , "Dexterous" , "Taped (anag.)" , "Skilful and adroit" .)