Called for silver during sports day (5)
I believe the answer is:
paged
'called for' is the definition.
(paging is a kind of calling for)
'silver during sports day' is the wordplay.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'during' means one lot of letters goes inside another.
'sports' becomes 'pe' (Physical Education).
'day' becomes 'd' (abbreviation for day).
'ag' going inside 'pe' is 'page'.
'page'+'d'='PAGED'
(Other definitions for paged that I've seen before include "Called a name over a PA system" , "Called over a public address system" , "Summoned over a PA system" , "Called to phone" , "called by Speaker" .)