Dispenser that's always slipping out of one's hand? (7)
I believe the answer is:
dropper
'hand?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for dropper that I've seen before include "Tube for applying a small amount of liquid" , "One can't catch" , "Medicinal device" , "Small tube with a rubber bulb at one end" , "Dispense with this" .)