Opening hip to fit femur’s tip (5)

I believe the answer is:

intro

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'opening' is the definition.
(short for introduction)

'hip to fit femur's tip' is the wordplay.
'hip' becomes 'in' (both can mean fashionable).
'to fit femur' becomes 'ort' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tip' is a reversal indicator (I've seen 'tipping' mean this).
'ort' backwards is 'tro'.
'in'+'tro'='INTRO'

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(Other definitions for intro that I've seen before include "Preliminary section (of music) (colloq.)" , "Opening passage (of music) (colloq.)" , "portion of song" , "Opening passage (abbr)" , "Prelude" .)

I've seen this clue in the Sydney Morning Herald.

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