Make low dive after emptying plane, banking roughly (6)
I believe the answer is:
deject
'make low dive after' is the definition.
I can't tell whether this definition defines the answer.
'emptying plane banking roughly' is the wordplay.
'emptying' becomes 'de' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'plane' becomes 'jet' (jet plane).
'banking' is an insertion indicator.
'roughly' becomes 'c' (circa).
'jet' going around 'c' is 'ject'.
'de'+'ject'='DEJECT'
Can you help me to learn more?
(Other definitions for deject that I've seen before include "Discourage" , "Make dispirited" , "Depress" .)