Crossword Genius

Joint invitation to cheer (3)

Ross

I believe the answer is:

hip

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'joint' is the definition.
(part of body)

I don't understand the rest of the clue.

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(Other definitions for hip that I've seen before include "Fruit of a rose plant" , "Haunch" , "Trendy bodily joint?" , "In slang, trendy or stylish like body joint" , "Pelvic joint" .)

I've seen this clue in The Irish Independent.
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