Writer's block? (7)
'writer's block?' is the definition.
(block of paper)
'writer's block?' is the wordplay.
'writer's' becomes 'note' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'block?' becomes 'pad' (pad is a kind of block).
'note'+'pad'='NOTEPAD'
Can you help me to learn more?
(Other definitions for notepad that I've seen before include "type of computer" , "Tablet" , "PC" , "scribbler" , "On which one writes" .)
(Other definitions for press box that I've seen before include "Enclosure for journalists at an event" , "Enclosure for reporters at a sporting event" , "Area for journalists at a sporting venue" , "Unit reserved for reporters at a sporting event" , "Area at events set aside for journalists" .)