It's complex, but we finish the job (3)

I believe the answer is:

web

I'm a little stuck... Click here to teach me more about this clue!

'it's complex' is the definition.
I can't judge whether this defines the answer.

'we finish the job' is the wordplay.
'finish' suggests the final letters.
The final letter of 'job' is 'b'.
'we'+'b'='WEB'

'but' acts as a link.

Can you help me to learn more?

(Other definitions for web that I've seen before include "Internet site for spider?" , "Interwoven structure" , "Complicated plot" , "Network; mesh" , "Spider's construction" .)

I've seen this clue in the Evening Standard.

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