Experience origin of surrealism in art gallery (5)
I believe the answer is:
taste
'experience' is the definition.
(taste can mean to experience or try out)
'origin of surrealism in art gallery' is the wordplay.
'origin of' indicates taking the first letters.
'in' means one lot of letters goes inside another.
'art gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
The initial letter of 'surrealism' is 's'.
's' placed inside 'tate' is 'TASTE'.
(Other definitions for taste that I've seen before include "Sample by eating or drinking a little" , "Flavour or discrimination" , "Partake of" , "Small portion" , "Sample, savour" .)