Where you might see film star making first appearance? (5)
I believe the answer is:
onset
'first appearance?' is the definition.
'where you might see film star' is the wordplay.
I cannot quite see how this works, but
'film' could be 'et' and 'et' is present in the answer.
The remaining letters 'ons' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'making' is the link.
(Other definitions for onset that I've seen before include "Attack using stone" , "Beginning or early stages" , "Inception" , "origin" , "Beginning (of disease etc)" .)