Indiana NBAer (5)
I believe the answer is:
pacer
'indiana nbaer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pacer that I've seen before include "Racing horse with an unusual gait" , "One setting race speed" , "Racehorse" , "early race leader?" , "Horse; one setting speed" .)