How many have less feeling? (6)
I believe the answer is:
number
I believe this is a double definition.
'how many' is the first definition.
'less feeling?' is the second definition.
(more numb)
'have' acts as a link.
(Other definitions for number that I've seen before include "Is it sung" , "Count; amount" , "Arithmetical value; song" , "No longer" , "less sensitive" .)