Daughter and I emphasise pain (8)
I believe the answer is:
distress
'pain' is the definition.
(I know that distress is a type of pain)
'daughter and i emphasise' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'and' means one lot of letters go next to another.
'emphasise' becomes 'stress' (synonyms).
'd'+'i'+'stress'='DISTRESS'
(Other definitions for distress that I've seen before include "Deep anxiety" , "Extreme pain, poverty" , "Extreme anxiety or pain" , "Extreme sorrow or pain" , "Suffering, worry" .)