clean ‧ ing /ˈkliːnɪŋ/ BrE AmE noun [uncountable]
[ Word Family: noun : ↑ cleaner , ↑ cleaning , ↑ cleanliness , ↑ clean , ↑ cleanser ; verb : ↑ clean , ↑ cleanse ; adverb : ↑ clean , ↑ cleanly ; adjective : ↑ clean ≠ ↑ unclean ]
the process or job of making a house, office etc clean:
Liz comes on Thursdays to do the cleaning.
cleaning lady/woman (=a woman who cleans houses, offices etc as her job)