Support performances around some trees – they’re useful for chase scenes (9,5)

'trees they're useful for chase scenes' is the definition.
I know nothing about this answer so I can't tell whether this works.

'support performances around some' is the wordplay.
I cannot really understand how this works, but
'support' could be 'bra' (a support for the breasts) and 'bra' is found in the answer.
'performances' could be 'turns' (a turn is a theatrical performance) and 'turns' is found in the answer.
'some' could be 'a' and 'a' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?