Intrepid district attorney to make call (6)
I believe the answer is:
daring
'intrepid' is the definition.
(I've seen this before)
'district attorney to make call' is the wordplay.
'district attorney' becomes 'D.A.' (abbreviation).
'to make call' becomes 'ring' (as in a phone call).
'da'+'ring'='DARING'
(Other definitions for daring that I've seen before include "Take (control)" , "Derring-do" , "Venturesome" , "Risque" , "A grind (anag.)" .)