He is on, he's performing, polishing up act (9)

I believe the answer is:

shoeshine

I'm a little stuck... Click here to teach me more about this clue!

'polishing up act' is the definition.
'shoeshine' can be an answer for 'polishing' (I have seen 'Polishing of footwear' mean 'shoeshine' so perhaps 'polishing' could also mean 'shoeshine'). I'm not sure about the 'up act' bit.

'he is on he's performing' is the wordplay.
'performing' indicates an anagram (the letters move around or 'perform').
'he'+'is'+'on'+'hes'='heisonhes'
'heisonhes' with letters rearranged gives 'SHOESHINE'.

Can you help me to learn more?

(Other definitions for shoeshine that I've seen before include "Footwear polishing (US)" , "Footwear cleaning (US)" , "polish" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.