STUBBS
Definition: Painter (read "Painter's" as "Painter is")
S from "centrepiece to tranSform"
TUBBS from "character of Local Shop in Royston Vasey"
I thought "TUBBS" was the wife in the Local Shop. Is it really their surname?
I too would like to see the decomposition of the SYSTEM-BUILT clue, I put that in from the Def.: "made from standard parts"
This was very hard - in fact STUBBS was the first I put in (spot the L of G fan), and that swine ending in the T of SYSTEM-BUILT the last (confirming it was BUILT rather than BUILD).