Answer: maintenance

AnswerCrossword Clue
MAINTENANCEBiggest job of our Service of Supply.
maintenancethe act of maintaining / to keep in working order
maintenanceact of preserving or keeping in appropriate condition; state of being maintained
maintenancealimony or child support
maintenancecare or upkeep, as of machinery or property
maintenancemeans of support, or subsistence; livelihood
maintenanceadministered to sustain a desired condition