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Short girl crossing European river by a rosaceous shrub (8)

Ross

I believe the answer is:

japonica

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'rosaceous shrub' is the definition.

I don't understand how the remainder of the clue works.

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(Other definitions for japonica that I've seen before include "Shrub with yellowish fruit" , "plant" , "Asian shrub of the rose family - I cap Joan (anag)" , "Camellia" , "Asian shrub of the rose family, with showy flowers" .)

I've seen this clue in The Times.
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