Crossword Genius

Thick people of rank dismissing books (7)

Ross

I believe the answer is:

viscous

I'm a little stuck... Click here to teach me more about this clue!

'thick' is the definition.
(similar in meaning)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for viscous that I've seen before include "Thick and gluey, like heavy oil" , "Treacly" , "Resistant to flow" , "Thick, sticky (liquid)" , "Gelatinous" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app