Plough wealth into backward North East? Very funny! (6)

I believe the answer is:

enrich

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'plough wealth into' is the definition.
I can't tell whether this defines the answer.

'backward north east? very funny' is the wordplay.
'backward' is a reversal indicator.
'north east?' becomes 'ne'.
'very funny' becomes 'rich' (I can't justify this - if you can you should believe this answer much more).
'ne' in reverse letter order is 'en'.
'en'+'rich'='ENRICH'

Can you help me to learn more?

(Other definitions for enrich that I've seen before include "Give money" , "Make fuller flavoured" , "Concentrate" , "Add to and improve" , "Heighten" .)

I've seen this clue in The Guardian.

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