Go out of your way to show how supple you are? (4,9)

'go out of your way to show how supple you are?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'go out of your way to show how supple you are?' is the wordplay.
I cannot quite see how this works, but
'go' could be 'back' (backing is a kind of going) and 'back' is found in the answer.
'way' could be 'rd' (short for road) and 'rd' is located in the answer.
'are?' could be 'was' (being is a kind of being) and 'was' is found in the remaining letters.
The remaining letters 'bend' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?