Model involved in homicide allegedly (5)
I believe the answer is:
ideal
'model' is the definition.
(ideal is a kind of model)
'involved in homicide allegedly' is the wordplay.
'involved in' indicates the answer is hidden within the clue.
'IDEAL' is hidden in the letters of 'homicide allegedly'.
(Other definitions for ideal that I've seen before include "Very eager (to see)" , "'Perfect, model (5)'" , "Embodying perfection" , "that can't be bettered?" , "Optimal" .)