Authorised new poem on bound girdles (9)
I believe the answer is:
empowered
'authorised' is the definition.
(empowering is a kind of authorising)
'new poem on bound girdles' is the wordplay.
'new' indicates anagramming the letters.
'on' becomes 're' ('on' can be mean 'with reference to').
'bound' is an insertion indicator.
'girdles' becomes 'wed' (I can't justify this - if you can you should give a lot more credence to this answer).
're' placed inside 'wed' is 'wered'.
'poem' with letters rearranged gives 'empo'.
'empo'+'wered'='EMPOWERED'
Can you help me to learn more?
(Another definition for empowered that I've seen is " Given authority".)