Daughter of Muhammad (6)
I believe the answer is:
fatima
'daughter of muhammad' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fatima that I've seen before include "significant figure in Islam" , "Youngest daughter of Muhammad" , "Place of Marian pilgrimage in Portugal" , "Famous basilica-shrine in Portugal, or Muhammad's daughter" , "Female" .)