Wicked act; went around starting hitting tibia (4)
I believe the answer is:
shin
'tibia' is the definition.
(synonyms)
'wicked act went around starting hitting' is the wordplay.
'wicked act' becomes 'sin' (sin is a kind of act. I am not sure about the 'wicked' bit.).
'went around' means one lot of letters goes inside another.
'starting' suggests taking the first letters.
The first letter of 'hitting' is 'h'.
'sin' placed around 'h' is 'SHIN'.
Can you help me to learn more?
(Other definitions for shin that I've seen before include "letter from Israel" , "bit of leg" , "Body part" , "Leg-bone" , "Part of the lower leg" .)