Difficult part for Elizabeth Arden (4)
I believe the answer is:
hard
'difficult' is the definition.
(synonyms)
'part for elizabeth arden' is the wordplay.
'part' says the answer is hidden in the clue.
'HARD' can be found hidden inside 'for elizabeth arden'.
(Other definitions for hard that I've seen before include "Tough - difficult" , "Unyielding" , "impenetrable" , "Firm, rigid, road leading to foreshore" , "Strenuous" .)