A2 had George Lucas initially confused (10)

I believe the answer is:

loggerhead

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'a2' is the definition.
I can't tell whether this definition defines the answer.

'had george lucas initially confused' is the wordplay.
'initially' suggests taking the first letters.
'confused' indicates an anagram.
The first letter of 'lucas' is 'l'.
'had'+'george'+'l'='hadgeorgel'
'hadgeorgel' with letters rearranged gives 'LOGGERHEAD'.

Can you help me to learn more?

(Another definition for loggerhead that I've seen is " turtle with worldwide presence".)

I've seen this clue in The Guardian.

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