Some brash entrant, pale (5)
I believe the answer is:
ashen
'pale' is the definition.
(synonyms)
'some brash entrant' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ASHEN' is hidden in the letters of 'brash entrant'.
(Other definitions for ashen that I've seen before include "White" , "Drained of colour" , "of Tree" , "pale in colour" , "bleached" .)