Lecture a daughter over clothes (7)
I believe the answer is:
address
'lecture' is the definition.
(address a speech to an audience)
'a daughter over clothes' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'over' means one lot of letters go next to another.
'clothes' becomes 'dress' (dress is a kind of clothes).
'a'+'d'+'dress'='ADDRESS'
(Other definitions for address that I've seen before include "prepare for post" , "lecture?" , "skilfulness or tact" , "Where one lives" , "Sermon - lodging" .)