Commanding officer in corrupt prison's a dangerous individual (8)
I believe the answer is:
scorpion
'a dangerous individual' is the definition.
(creature with a sting)
'commanding officer in corrupt prison's' is the wordplay.
'commanding officer' becomes 'co'.
'in' indicates putting letters inside.
'corrupt' indicates an anagram.
'prison' anagrammed gives 'srpion'.
'co' going within 'srpion' is 'SCORPION'.
(Other definitions for scorpion that I've seen before include "As above (Latin)" , "Venomous stinger" , "Venemous creature" , "Small spider with pincers and stinging tail" , "Poisonous creature" .)