### Clue: Hollow black-framed spectacles suit groups of readers (4,5)
### Answer: BOOK CLUBS 
 ### Explanation: Definition: groups of readers
 **Inner letters deleted from**(Hollow) "black" **containing**(framed) OO(representing spectacles, as in the emoticon "O-O" for one wearing glasses) + CLUBS(one of the four suits in a deck of playing cards).