Painstaking (13)
There are a few possibilities for this:
conscientious
'painstaking' is the definition.
(I know that painstaking can be written as conscientious)
This is the entire clue.
(Other definitions for conscientious that I've seen before include "Diligent" , "Taking great pains" , "like some who object?" , "Painstaking" , "Wishing to do what's right" .)
'painstaking' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for thorough that I've seen before include "Carried out completely and carefully" , "Doing things with great attention to detail" , "Careful, attending to every detail" , "Complete; utter" , "Sweeping" .)
'painstaking' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for diligent that I've seen before include "Painstaking - I tingled (anag)" , "Steady in application and industry" , "Steady and hard-working" , "Working hard and conscientiously" , "Putting care and effort into work" .)