Showing great care in artist's workroom with us (8)
I believe the answer is:
studious
'showing great care' is the definition.
(studious means taking great care about something)
'artist's workroom with us' is the wordplay.
'artist's workroom' becomes 'studio' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'studio'+'us'='STUDIOUS'
'in' is the link.
(Other definitions for studious that I've seen before include "Bookish, sedulous" , "Given to serious reading" , "Diligent; scholarly" , "Diligent, assiduous" , "Devoted to learning; deliberate" .)