Museum offering (3)
I believe the answer is:
art
'museum offering' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for art that I've seen before include "Work such as paintings or sculptures" , "Cunning" , "-- Garfunkel, singer" , "Creative works; knack" , "For example, Blakey's creative" .)