Daughter on time to entertain adult film star (5)

I believe the answer is:

donat

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

'film star' is the definition.
I know nothing about this answer so I can't tell whether this works.

'daughter on time to entertain adult' is the wordplay.
'daughter' becomes 'd'.
'time' becomes 't'.
'to entertain' is an insertion indicator.
'adult' becomes 'a'.
'on'+'t'='ont'
'ont' enclosing 'a' is 'onat'.
'd'+'onat'='DONAT'

Can you help me to learn more?

I've seen this clue in The Telegraph.

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