Speech son initially dreads is rewritten (7)
I believe the answer is:
address
'speech' is the definition.
(synonyms)
'son initially dreads is rewritten' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'initially' is a charade indicator (letters next to each other).
'is rewritten' is an anagram indicator (I've seen 'being rewritten' mean this).
'dreads' is an anagram of 'addres'.
's' after 'addres' is 'ADDRESS'.
(Other definitions for address that I've seen before include "Place where someone lives" , "Formal speech" , "Speak to - direct" , "lecture?" , "Speech; one's home" .)