Heard dull person referring to Dutch settler (4)
I believe the answer is:
boer
'settler' is the definition.
'heard dull person' is the wordplay.
'heard' indicates a 'sounds like' (homophone) clue.
'dull person' becomes 'bore' (I've seen this in another clue).
'bore' sounds like 'BOER'.
'referring to dutch' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for boer that I've seen before include "South African of Dutch ancestry" , "one from East London perhaps" , "Afrikaner" , "South African such as President Kruger" , "once our enemy" .)