Crossword Genius

Actors show they have star potential (6)

Ross

I believe the answer is:

castor

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

'star potential' is the definition.
'castor' can be an answer for 'star' (I've seen this before). I'm not certain of the 'potential' bit.

'actors show they' is the wordplay.
'actors' anagrams to 'CASTOR'.
But, I am not sure how the anagram is indicated.

'have' is the link.

Can you help me to learn more?

(Other definitions for castor that I've seen before include "hat" , "Sprinkler" , "Small swivelling wheel on a furniture leg" , "Chair wheel" , "Trolley wheel" .)

I've seen this clue in The Globe and Mail.
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