Hard to get woman returning a dye (5)
I believe the answer is:
henna
'a dye' is the definition.
(reddish-brown dye)
'hard to get woman returning' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'to get' is a charade indicator (letters next to each other).
'woman' becomes 'anne' (woman's name).
'returning' says the letters should be written in reverse.
'anne' reversed gives 'enna'.
'h'+'enna'='HENNA'
(Other definitions for henna that I've seen before include "Red hair dye" , "Red-brown plant dye" , "Hair/skin dye" , "Natural hair dye" , "Shrub used for cosmetic colouring" .)