Henry rejecting Boleyn's hair dye (5)
I believe the answer is:
henna
'hair dye' is the definition.
(henna is a kind of hair dye)
'henry rejecting boleyn's' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'rejecting' shows that the letters should be reversed in order (I've seen 'rejected' mean this).
'boleyn' becomes 'anne' (I've seen this in another clue).
'anne' written backwards gives 'enna'.
'h'+'enna'='HENNA'
(Other definitions for henna that I've seen before include "natural colour?" , "Shrub used for cosmetic colouring" , "Vegetable dye" , "Beauty aid" , "shock treatment" .)