Daughter having too much port (5)
I believe the answer is:
dover
'port' is the definition.
(English port)
'daughter having too much' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'having' says to put letters next to each other.
'too much' becomes 'over' (I've seen this before).
'd'+'over'='DOVER'
(Other definitions for dover that I've seen before include "Roved around the English port" , "White cliffs port" , "Cinque Port" , "Sort of sole" , "Be aware of" .)