Grounding an attractive posterior? (8,6)

I believe the answer is:

striking bottom

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'grounding an' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'attractive posterior?' is the wordplay.
'attractive' becomes 'striking' (I can't justify this - if you can you should give a lot more credence to this answer).
'posterior?' becomes 'bottom' (synonyms).
'striking'+'bottom'='STRIKING BOTTOM'

Can you help me to learn more?

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

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