Sample of police kit Met finally accepted (6)
I believe the answer is:
taster
'sample' is the definition.
(I've seen this before)
'police kit met finally accepted' is the wordplay.
'police kit' becomes 'Taser' (weapon used by police).
'finally' says to take the final letters.
'accepted' means one lot of letters goes inside another.
The final letter of 'met' is 't'.
'taser' going around 't' is 'TASTER'.
'of' is the link.
(Other definitions for taster that I've seen before include "Brief sample" , "One trying" , "person in charge of testing" , "Small sample" , "extract" .)