In need of exercise book here? (9)
I believe the answer is:
gymnasium
'book here?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for gymnasium that I've seen before include "Saying Mum (anag.)" , "Training room" , "Hall for PE" , "Place for physical exercises" , "Athletics facility" .)