Old artist's getting in bath regularly with island folk! (9)
I believe the answer is:
tahitians
'island folk' is the definition.
(residents of Tahiti)
'old artist's getting in bath regularly' is the wordplay.
'old artist's' becomes 'titians' (16th-century painter. I am not sure about the 'old' bit.).
'getting in' indicates putting letters inside.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'bath' are 'ah'.
'titians' placed around 'ah' is 'TAHITIANS'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for tahitians that I've seen before include "some 16 [ISLANDER] s" , "race on island" , "some painted by Gauguin" , "Polynesian types" , "Islanders in the 1 ac" .)