Premier beat Trump's story (5,5)

I believe the answer is:

first floor

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

'trump's story' is the definition.
'first floor' can be an answer for 'story' (first floor is a kind of story). I'm not sure about the 'trump's' bit.

'premier beat' is the wordplay.
'premier' becomes 'first' (similar in meaning).
'beat' becomes 'floor' (flooring is a kind of beating).
'first'+'floor'='FIRST-FLOOR'

Can you help me to learn more?

(Another definition for first floor that I've seen is " Part of department store".)

I've seen this clue in The Independent.

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