Very involved in covers of biweekly publication filled by worker? (9)

I believe the answer is:

byzantine

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'very involved' is the definition.
'Byzantine' can be an answer for 'involved' (synonyms). I am not sure about the 'very' bit.

'covers of biweekly publication filled by worker?' is the wordplay.
'covers of' means to remove the middle letters.
'publication' becomes 'zine' (I've seen this before).
'filled by' indicates putting letters inside.
'worker?' becomes 'ant' (worker is a type of ant).
'biweekly' with its middle taken out is 'by'.
'zine' enclosing 'ant' is 'zantine'.
'by'+'zantine'='BYZANTINE'

'in' is the link.

Can you help me to learn more?

(Other definitions for byzantine that I've seen before include "Highly complex - intricate" , "Complicated and devious like Eastern Roman Empire" , "Excessively complicated" .)

I've seen this clue in The Independent.

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