Fungus making youth leader point (5)
I believe the answer is:
yeast
'fungus' is the definition.
(I know that yeast is a type of fungus)
'youth leader point' is the wordplay.
'youth leader' becomes 'y' (I've seen this in other clues).
'point' becomes 'east' (east is a kind of point).
'y'+'east'='YEAST'
'making' acts as a link.
(Other definitions for yeast that I've seen before include "It makes dough rise" , "lifting agent" , "that baker needs" , "A raising agent in baking" , "Androgynous" .)