Authorising chap after it? (9)
I believe the answer is:
mandating
'authorising' is the definition.
(I've seen this before)
'chap after it?' is the wordplay.
'chap' becomes 'man' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'it?' becomes 'dating' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'man'+'dating'='MANDATING'
Can you help me to learn more?
(Another definition for mandating that I've seen is " Authorising".)