Finally attain a high position (3,2)
I believe the answer is:
end up
'finally' is the definition.
(I've seen this before)
'attain a high position' is the wordplay.
I cannot really understand how this works, but
'high' could be 'up' (associated in meaning) and 'up' is found within the answer.
'position' could be 'end' (end is a kind of position) and 'end' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for end up that I've seen before include "Ultimately become" , "standing on one's head" , "Come to rest" , "finish ahead" , "Finally do or become (something)" .)