Mercurial movie star's hit has one shock trailer full of sex (4,5)

'shock trailer full of sex' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'mercurial movie star's hit has one' is the wordplay.
I cannot quite understand how this works, but
'hit' could be 'ram' (ram can mean to hit something) and 'ram' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
The remaining letters 'malek' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?