Old volume, one a lad's binding, shows events (9)
I believe the answer is:
occasions
'events' is the definition.
(occasion is a kind of event)
'old volume one a lad's binding' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'volume' becomes 'cc'.
'one' becomes 'i' (Roman numeral).
'lad's' becomes 'sons'.
'binding' indicates putting letters inside.
'a'+'sons'='asons'
'i' going into 'asons' is 'asions'.
'o'+'cc'+'asions'='OCCASIONS'
'shows' is the link.
(Other definitions for occasions that I've seen before include "Special times or events" , "Celebrations" , "Causes to happen" , "Social events" .)