Impedes risky undertakings (6)
I believe the answer is:
stunts
This clue might be a double definition.
'impedes' is the first definition.
(stunting is a kind of impeding)
'risky undertakings' is the second definition.
The answer and definition can be both acts as well as being plural nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for stunts that I've seen before include "Prevents from growing properly" , "Prevents further development" , "spectacular performances" , "daring manoeuvres" , "Retards development" .)