Feeling less in need of new pigment (5)
I believe the answer is:
umber
'pigment' is the definition.
(I know that umber is a type of earth color)
'feeling less in need of new' is the wordplay.
'feeling less' becomes 'number' (more numb).
'in need of' suggests deleting specific letters.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'number' with 'n' taken away is 'UMBER'.
(Other definitions for umber that I've seen before include "Yellow-brown pigment" , "Yellowish-brown pigment" , "Brown earthy substance used as pigment" , "Natural colouring matter, dark brown" , "Usually dark brown mineral" .)