Not divided into parts (10)
I believe the answer is:
indiscrete
'not divided into parts' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for indiscrete that I've seen before include "Whole" , "Undivided" , "not divided" , "Homogeneous and indivisible (anag of 1 across, 6 and 23)" .)