Means of communicating with a daughter in port (5)
I believe the answer is:
radio
'means of communicating' is the definition.
'radio' can be an answer for 'communicating' (radio is a kind of communicating). I am not sure about the 'means of' bit.
'a daughter in port' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'in' is an insertion indicator.
'port' becomes 'rio' (Rio de Janeiro is a port).
'a'+'d'='ad'
'ad' inserted within 'rio' is 'RADIO'.
'with' is the link.
Can you help me to learn more?
(Other definitions for radio that I've seen before include "Communicate with" , "Part of the broadcasting industry" , "Marconi invented it" , "Contact" , "Communications medium" .)