Communicate with a daughter in Brazilian port (5)
I believe the answer is:
radio
'communicate with' is the definition.
(I've seen this before)
'a daughter in brazilian port' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'in' means one lot of letters goes inside another.
'brazilian port' becomes 'rio' (I've seen this before).
'a'+'d'='ad'
'ad' placed within 'rio' is 'RADIO'.
(Other definitions for radio that I've seen before include "Communications device" , "Receiving device" , "Part of the broadcasting industry" , "Communications receiver" , "Broadcasting medium" .)