Intensely study book to get ahead of others (4,2)
I believe the answer is:
bone up
'intensely study' is the definition.
'bone up' can be an answer for 'study' (boning up is a kind of studying). I'm not sure about the 'intensely' bit.
'book to get ahead of others' is the wordplay.
I cannot quite see how this works, but
'book' could be 'b' (abbreviation for book) and 'b' is present in the answer.
'ahead' could be 'oneup' (I've seen this in another clue) and 'oneup' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bone up that I've seen before include "Study intensively, for an exam say" , "Cram" .)