Answer: stickler

AnswerCrossword Clue
STICKLERPerfectionist
STICKLEROne hard to budge
STICKLERStrict disciplinarian.
STICKLERPurist
STICKLERDifficult problem
STICKLERSlave to detail
STICKLER"Perfectionist" label captivates Liberal (8)
STICKLERPerson not easily budged
sticklerA difficult problem; a conundrum
sticklerone that stickles (to argue stubbornly)
sticklerA person who insists on a certain quality or type of behavior