Being typically yellow, many aim so badly! (6)
I believe the answer is:
mimosa
'being typically yellow' is the definition.
I can't judge whether this defines the answer.
'many aim so badly' is the wordplay.
'many' becomes 'm' (Roman numeral for a thousand).
'badly' indicates an anagram (letters in the wrong order).
'aim'+'so'='aimso'
'aimso' is an anagram of 'imosa'.
'm'+'imosa'='MIMOSA'
Can you help me to learn more?
(Other definitions for mimosa that I've seen before include "Variety of acacia" , "Tropical tree with yellow flowers" , "Flower of Maoism?" , "Sensitive thing growing" , "Plant genus popularly extended to the Acacia" .)