Obtain by going out of turn (3)
I believe the answer is:
buy
'obtain' is the definition.
(thesaurus)
'going out of turn' is the wordplay.
'going' becomes 'by' (I am not sure about this - if you are sure you should believe this answer much more).
'out of' indicates putting letters inside.
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'by' going around 'u' is 'BUY'.
'by' is the link.
Can you help me to learn more?
(Other definitions for buy that I've seen before include "Procure" , "Accept truth of (colloq.)" , "Get" , "Purchase" .)