Cruise, say, I've arranged through part of Herzegovina (5,4)

I believe the answer is:

movie star

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'cruise say' is the definition.
(I know that Tom Cruise is a movie star)

'i've arranged through part of herzegovina' is the wordplay.
'arranged' is an anagram indicator (letters rearranged).
'through' is an insertion indicator (inserted letters go through the word).
'part of herzegovina' becomes 'mostar' (I can't justify this - if you can you should give a lot more credence to this answer).
'ive' is an anagram of 'vie'.
'vie' going within 'mostar' is 'MOVIE-STAR'.

Can you help me to learn more?

(Other definitions for movie star that I've seen before include "Big player" , "VIP on set" , "Cruise, perhaps" , "Film idol" , "Hoping for an Oscar" .)

I've seen this clue in The Independent.

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