Inclines not to start conclusions (4)
I believe the answer is:
ends
'conclusions' is the definition.
(end is a kind of conclusion)
'inclines not to start' is the wordplay.
'inclines' becomes 'tends' ('tend' can be a synonym of 'incline').
'not to start' means to remove the first letter.
'tends' with its initial letter removed is 'ENDS'.
(Other definitions for ends that I've seen before include "'Goals, objectives (4)'" , "ambitions" , "Completes - purposes" , "Halts" , "Desired results" .)