Opening move removing initial limits (5)
I believe the answer is:
ambit
'limits' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ambit that I've seen before include "Circumference" , "Range, scope" , "round" , "Compass, scope" , "Range - surroundings" .)