Remaining in position, perplexed percussionist abandons process. (2,4)
I believe the answer is:
in situ
'remaining in position perplexed percussionist abandons process' is the definition.
I can't judge whether this defines the answer.
'perplexed percussionist abandons process' is the wordplay.
'perplexed' indicates anagramming the letters.
'abandons' is a deletion indicator.
'percussionist' with 'process' taken out is 'uinist'.
'uinist' anagrammed gives 'IN-SITU'.
Can you help me to learn more?
(Other definitions for in situ that I've seen before include "Without being moved" , "Appropriately located" , "In the natural position (Latin)" , "Occupying the original or appropriate position" , "Appropriately positioned" .)