Bust beginning to cause sexual excitement (8)

I believe the answer is:

carousal

'bust' is the definition.
(thesaurus)

'beginning to cause sexual excitement' is the wordplay.
'beginning to' says to take the initial letters.
'sexual excitement' becomes 'arousal' (I've seen this before).
The first letter of 'cause' is 'c'.
'c'+'arousal'='CAROUSAL'

(Other definitions for carousal that I've seen before include "Lively drinking party" , "Bacchanal" , "Merry drinking spree" , "A drink-and-be-merry session" , "Revels" .)

I've seen this clue in The Independent.

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