Actor perhaps at first welcoming resistance (6)
I believe the answer is:
artist
'actor perhaps' is the definition.
I can't judge whether this definition defines the answer.
'at first welcoming resistance' is the wordplay.
'first' becomes 'ist' ().
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'resistance' becomes 'r' (abbreviation).
'at'+'ist'='atist'
'atist' going around 'r' is 'ARTIST'.
Can you help me to learn more?
(Other definitions for artist that I've seen before include "Painter in dire strait" , "Creator of beauty" , "Eg, a painter" , "Creator of aesthetic works" , "Strait (anag)" .)