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 judge whether this defines the answer.
'emptying plane banking roughly' is the wordplay.
'emptying' becomes 'de' (I can't explain this - if you can you should believe this answer much more).
'plane' becomes 'jet' (jet plane).
'banking' means one lot of letters goes inside another.
'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" .)