Is usually bent over the sink (3)
I believe the answer is:
tap
But I can't explain it at all! Could you help me understand?
(Other definitions for tap that I've seen before include "Light touch (hot or cold?)" , "non-violent strike" , "that's less hard than 11 [BASH] or 22 [BATTER]" , "Water source; take advantage of" , "Obtain money from" .)