Old-fashioned father hoards toffee wrappers (5)
I believe the answer is:
dated
'old-fashioned' is the definition.
(I've seen this before)
'father hoards toffee wrappers' is the wordplay.
'father' becomes 'dad' (informal term for father).
'hoards' indicates putting letters inside (hoard can mean to contain).
'wrappers' means to remove the middle letters.
'toffee' with its middle removed is 'te'.
'dad' enclosing 'te' is 'DATED'.
(Other definitions for dated that I've seen before include "Unfashionable" , "Obsolete" , "Met socially by arrangement" , "Old fashioned" , "square" .)