Spread element of culture, say, enthralling English girl (8)
I believe the answer is:
margaret
'girl' is the definition.
(girl's name)
'spread element of culture say enthralling english' is the wordplay.
'spread' becomes 'marg' (short for margarine).
'element of culture say' becomes 'art' (art is an aspect of culture).
'enthralling' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'art' enclosing 'e' is 'aret'.
'marg'+'aret'='MARGARET'
(Other definitions for margaret that I've seen before include "Thatcher, perhaps" , "Princess and Thatcher" , "Scottish Queen/Saint" , "Name of saintly Scottish queen" , "Girl's name" .)