Some brash entrepreneur, pale (5)
I believe the answer is:
ashen
'pale' is the definition.
(synonyms)
'some brash entrepreneur' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'ASHEN' is hidden in the letters of 'brash entrepreneur'.
(Other definitions for ashen that I've seen before include "Grey-faced" , "pale in colour" , "Drained of colour" , "may be pale with shock" , "Pale (faced)" .)