Seeing that, I give up (6)

I believe the answer is:

forego

'give up' is the definition.

'seeing that i' is the wordplay.
'seeing that' becomes 'for' (both can mean 'because').
'i' becomes 'ego' (I've seen this before**).
'for'+'ego'='FOREGO'

(Other definitions for forego that I've seen before include "Get ahead" , "Take precedence" , "Surrender" , "Go without or precede" , "Go without (something desirable)" .)

I've seen this clue in The Guardian.

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