Hold forth about gang leader, getting shot (7)
I believe the answer is:
opaline
'shot' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'hold forth about gang leader' is the wordplay.
'hold forth' becomes 'opine' (I've seen this before).
'about' indicates putting letters inside.
'gang leader' becomes 'al' (Al Capone).
'opine' enclosing 'al' is 'OPALINE'.
'getting' acts as a link.
(Other definitions for opaline that I've seen before include "white!" , "Milk glass" , "like a stone" , "milky" , "not entirely clear" .)