Digs without good spade, say, in shed (7)
I believe the answer is:
discard
'shed' is the definition.
(thesaurus)
'digs without good spade say' is the wordplay.
'without' suggests deleting specific letters.
'good' becomes 'g' (abbreviation).
'spade say' becomes 'card' (spade is a kind of card).
'digs' with 'g' taken out is 'dis'.
'dis'+'card'='DISCARD'
'in' is the link.
(Other definitions for discard that I've seen before include "Get rid of" , "Throw away or cast off" , "Jettison" , "Shed" , "Abandon" .)