At half time, left a note for the king (6)

I believe the answer is:

attila

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'king' is the definition.
(Attila is an example)

'at half time left a' is the wordplay.
'half' indicates taking half.
'left' becomes 'l' (common abbreviation).
'time' halved is 'ti'.
'at'+'ti'+'l'+'a'='ATTILA'

'note for the' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for attila that I've seen before include "Hunnish ruler" , "conquered Europe" , "5th century king of the Huns who sacked Rome" , "The Scourge of God" , "Fifth century king of the Huns" .)

I've seen this clue in the Evening Standard.

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