Even more complex trade contract (5)

I believe the answer is:

extra

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'even more' is the definition.
'extra' can be an answer for 'more' (I've seen this in other clues). I'm unsure of the 'even' bit.

'complex trade contract' is the wordplay.
'contract' says the answer is hidden in the clue (I've seen 'contracted' mean this).
'EXTRA' can be found hidden inside 'complex trade'.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Cricket run; unusually" , "Surplus to requirements" , "Additional, more than expected" , "Additional - bye" , "Player taking little part" .)

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

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