Legendary lover admitted dealing in drugs (6)
I believe the answer is:
isolde
'legendary lover' is the definition.
(I've seen this before)
'admitted dealing in drugs' is the wordplay.
I cannot really understand how this works, but
'drugs' could be 'e' (somebody 'on E' could also be 'on drugs') and 'e' is found within the answer.
The remaining letters 'isold' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for isolde that I've seen before include "Tristan and ... (Wagner opera)" , "Arthurian queen" , "for Tristram" , "Soiled like Tristan's lover" , "Wagner heroine" .)