Clue: Conspicuous volume of doubly fine drugs swallowed by company board with caution (6-5,4)
Answer: COFFEE-TABLE BOOK
Explanation: Definition: Conspicuous volume
FF + EE; both inside CO (company) + TABLE="board" + BOOK="caution" 
FF is double F, for "doubly fine"
 
EE is more than one E for ecstasy, "drugs"
 
a football referee might book/caution a player by giving them a yellow card