Yank, engrossed by clue for bloodhound, sits nervously for investigators (10)
I believe the answer is:
scientists
'yank engrossed by clue for bloodhound' is the definition.
I can't judge whether this definition defines the answer.
'sits nervously for investigators' is the wordplay.
'nervously' is an anagram indicator.
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'investigators' becomes 'scient' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sits' anagrammed gives 'ists'.
'ists' put after 'scient' is 'SCIENTISTS'.
Can you help me to learn more?
(Other definitions for scientists that I've seen before include "They study" , "Eg, physicists, biologists" , "Boffins" , "Insects sit (anag.)" .)