Stand to ease pressure on back? (9,6)

'stand' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

'ease pressure on back?' is the wordplay.
I cannot quite understand how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found in the answer.
'back?' could be 'act' (back is a kind of act) and 'act' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?