Demanding to drop target? Hold on (5)
I believe the answer is:
cling
'hold on' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for cling that I've seen before include "Stick close (to surface)" , "Clasp closely" , "Hold, cleave" , "Hold on tightly, refuse to abandon" , "Hold tightly, become attached" .)