Giving great yawns, tedious chore ends (8)
I believe the answer is:
largesse
'giving' is the definition.
'great yawns tedious chore ends' is the wordplay.
'great' becomes 'large' ('large' can be similar in meaning to 'great'**).
'ends' suggests the final letters.
The final letters of 'yawns tedious chore' are 'sse'.
'large'+'sse'='LARGESSE'
(Other definitions for largesse that I've seen before include "Bounty, gift" , "Generosity in giving gifts" , "Generosity in bestowing gifts" , "Magnanimous bestowal of gifts" , "Money or gifts generously given" .)