Container of explicit instructions (3)
I believe the answer is:
tin
'container' is the definition.
(tin is a kind of container)
'of explicit instructions' is the wordplay.
'of' indicates the answer is hidden within the clue.
'TIN' is hidden in the letters of 'explicit instructions'.
(Other definitions for tin that I've seen before include "A silvery-white metal, symbol Sn" , "loaf of bread" , "Silver-white metal, used to make cans" , "Ready" , "Silvery-white metal used in cans" .)