Ruthless force goes out to limit minor strike (7)
I believe the answer is:
gestapo
'ruthless force' is the definition.
'Gestapo' can be an answer for 'force' (Nazi secret police). I'm not certain of the 'ruthless' bit.
'goes out to limit minor strike' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'to limit' means one lot of letters goes inside another (outside letters limit or restrain others).
'minor strike' becomes 'tap' (tap can mean to strike or hit. I am not sure about the 'minor' bit.).
'goes' with letters rearranged gives 'geso'.
'geso' enclosing 'tap' is 'GESTAPO'.
Can you help me to learn more?
(Other definitions for gestapo that I've seen before include "Postage to Nazi secret police" , "Police detested" , "Geheime Staatspolizei" , "war force" , "Brutal force" .)