Having arrived to put on the show (7)
I believe the answer is:
present
'show' is the definition.
(I know that show can be written as present)
'having arrived to put on the' is the wordplay.
I cannot really see how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for present that I've seen before include "In attendance with award?" , "Exhibit" , "gift > offer" , "A Christmas gift" , "Gift; time now; here" .)