Answer: helper

AnswerCrossword Clue
HELPERAide
helperextra locomotive attached to a train at the front, middle, or rear, esp. to provide extra power for climbing a steep grade
helperone who helps (to give aid)
helperperson or thing that helps or gives assistance, support, etc.
HELPERAcolyte, e.g.
HELPERBenefactor
HELPERSecond hand
HELPERSanta's little ...
HELPERVolunteer, perhaps
HELPERMan Friday
HELPERAssistant
HELPERAssistant.
HELPERHandmaid.
HELPERAide.
HELPERContributor
HELPERArctic elf, for one
HELPERGofer
HELPERElf, to Santa
HELPERHand lender