Pollsters employing a native person (5)
I believe the answer is:
maori
'native person' is the definition.
(I've seen this before)
'pollsters employing a' is the wordplay.
'pollsters' becomes 'mori' (market research company Ipsos MORI).
'employing' indicates putting letters inside.
'mori' going around 'a' is 'MAORI'.
(Other definitions for maori that I've seen before include "One of New Zealand's aboriginal people" , "Native New Zealanders" , "Cook Islander" , "aboriginal inhabitant" , "Native of New Zealand and the Cook Islands" .)