Answer:

studious

Answer	Crossword Clue
STUDIOUS	Bookish
STUDIOUS	Hitting the books
STUDIOUS	Attentive.

STUDIOUS	Intent on learning.
STUDIOUS	Reflective.
STUDIOUS	Book-cracking
STUDIOUS	Diligent boss promises to pay (8)
STUDIOUS	Scholarly, well-bred male at accounts receivable (8)
STUDIOUS	Painstaking
STUDIOUS	Like diligent pupils