Game a dunderhead finished level (4)

I believe the answer is:

tied

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'finished level' is the definition.
'tied' can be an answer for 'level' (thesaurus). I am not certain of the 'finished' bit.

'game a dunderhead' is the wordplay.
'game' becomes 'tie' (I've seen this before).
'a dunderhead' becomes 'd' (head letter of 'dunder').
'tie'+'d'='TIED'

Can you help me to learn more?

(Other definitions for tied that I've seen before include "eg Scored 1-1" , "United" , "Restricted, bound" , "With an equal score" , "Made bow" .)

I've seen this clue in the Evening Standard.

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