Sample latest of exhibits in gallery (5)
I believe the answer is:
taste
'sample' is the definition.
(I know that sample can be written as taste)
'latest of exhibits in gallery' is the wordplay.
'latest of' suggests the final letters.
'in' indicates putting letters inside.
'gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
The final letter of 'exhibits' is 's'.
's' going into 'tate' is 'TASTE'.
(Other definitions for taste that I've seen before include "The ability to discern good quality" , "one of the 4 [SENSE] s" , "Impression from food" , "Refinement or flavour" , "Smack" .)