### Clue: Tending to set short clue about intelligence, is hard to follow (8)
### Answer: CLIQUISH 
 ### Explanation: Definition: Tending to set
 "clue" **minus its last letter**(short) **containing**(about) I.Q.(abbrev. for "intelligence quotient", a measure of intelligence) **placed after**(… to follow, in an across clue) [IS + H(abbrev. for "hard").
Defn: Having the tendency to join into a set;a small exclusive group of friends or associates.