Add in evidence about daughter (7)
I believe the answer is:
include
'add' is the definition.
(including is a kind of adding)
'in evidence about daughter' is the wordplay.
'evidence' becomes 'clue' (clue is a kind of evidence**).
'about' means one lot of letters goes inside another.
'daughter' becomes 'd'.
'clue' enclosing 'd' is 'clude'.
'in'+'clude'='INCLUDE'
(Other definitions for include that I've seen before include "Take in as part of unit" , "Contain as part of group" , "Feature" , "Consider as part of something" , "Throw in" .)