Prohibited acid pill soon unwrapped (5)
I believe the answer is:
taboo
'prohibited' is the definition.
(I know that prohibited can be written as taboo)
'acid pill soon unwrapped' is the wordplay.
'acid pill' becomes 'tab' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'unwrapped' indicates the central letters (the letters which wrap the word are removed).
The central letters of 'soon' are 'oo'.
'tab'+'oo'='TABOO'
Can you help me to learn more?
(Other definitions for taboo that I've seen before include "Socially prohibited" , "Not to be mentioned" , "Anathema" , "Prohibited by social custom" , "A ban or prohibition of superstitious kind" .)