Unsettled after Scientology's first dissemination (6)
I believe the answer is:
sowing
'dissemination' is the definition.
(thesaurus)
'unsettled after scientology's first' is the wordplay.
'unsettled' becomes 'owing' (I've seen this before).
'after' says to put letters next to each other.
'first' says to take the initial letters.
The initial letter of 'scientology' is 's'.
'owing' after 's' is 'SOWING'.
(Other definitions for sowing that I've seen before include "Placing seeds in the ground" , "Broadcasting" , "task in garden" , "Planting (seeds)" .)