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So, first, say you are in addition getting an oversupply (7)

Ross

I believe the answer is:

surplus

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'an oversupply' is the definition.
(I know that oversupply can be written as surplus)

'so first say you are in addition getting' is the wordplay.
'so' becomes 'lu' (I can't justify this - if you can you should give a lot more credence to this answer).
'first say' becomes 's' (lst letter of 'say').
'you are' becomes 'ur' (textspeak abbreviation).
'in addition' becomes 'PS' (postscript written at the end of a letter).
'getting' means one lot of letters goes inside another.
's'+'ur'+'ps'='surps'
'lu' put into 'surps' is 'SURPLUS'.

Can you help me to learn more?

(Other definitions for surplus that I've seen before include "unnecessary" , "(An) oversupply" , "Excess, extra" , "Extra to requirements" , "superfluity" .)

I've seen this clue in the Sydney Morning Herald.
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