Submit trouble ensued with three Rs (9)
I believe the answer is:
surrender
'submit' is the definition.
(thesaurus)
'trouble ensued with three rs' is the wordplay.
'three rs' can mean three replacements for 'r'.
'trouble' is an anagram indicator.
'with' indicates putting letters inside.
'ensued' is an anagram of 'suende'.
'r'+'r'='rr'
'suende' enclosing 'rr' is 'surrende'.
'surrende'+'r'='SURRENDER'
(Other definitions for surrender that I've seen before include "Wave the white flag" , "Yield, give in" , "Resign" , "Capitulation" , "Concede" .)