Shout for joy at the end of the day, performing one exercise in unoccupied place (6)
I believe the answer is:
yippee
'shout' is the definition.
(I have seen 'shout of excitement' mean 'yippee' so perhaps 'shout' could also mean 'yippee')
'joy at the end of the day performing one exercise in unoccupied place' is the wordplay.
'at the end of' suggests the final letters (I've seen 'at the end' mean this).
'the day performing' becomes 'i' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one exercise' becomes 'pe' (Physical Education).
'in' means one lot of letters goes inside another.
'unoccupied' says to hollow out the word (remove centre letters) (remove the inside letters which occupy the word).
'place' with its centre removed is 'pe'.
The last letter of 'joy' is 'y'.
'pe' placed into 'pe' is 'ppee'.
'y'+'i'+'ppee'='YIPPEE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for yippee that I've seen before include "Shout of wild delight" , "Cry of wild delight" , "expression of celebration" , "Cry of excitement" , "I'm very very very pleased!" .)