The term 'Reindeer Husbander' is a job title for someone who takes care of reindeer, and the crossword solution for this term is 'LAPP', which is an acronym for Laplander, a person from the northern parts of Scandinavia and Russia. The Laplanders are known for their traditional reindeer herding practices, and so the term 'Reindeer Husbander' is used to refer to someone who takes care of reindeer in the same way.