David's subject picking up some fruit, a rambutan (5)
I believe the answer is:
marat
'david's subject picking' is the definition.
I can't judge whether this defines the answer.
'up some fruit a rambutan' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'taram' is hidden in the letters of 'fruit a rambutan'.
'taram' backwards is 'MARAT'.
Can you help me to learn more?
(Other definitions for marat that I've seen before include "Charlotte Corday victim" , "murdered radical" , "revolutionary stabbed" , "French revolutionary killed by Charlotte Corday" , "French revolutionary politician" .)