Crossword Genius

Thickhead finally sacked by boss (5)

Ross

I believe the answer is:

dumbo

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'thickhead' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'finally sacked by boss' is the wordplay.
'finally' indicates one should take the final letters.
'by' is a charade indicator (letters next to each other).
'boss' becomes 'umbo' (the boss on a shield).
The final letter of 'sacked' is 'd'.
'd'+'umbo'='DUMBO'

Can you help me to learn more?

(Other definitions for dumbo that I've seen before include "1941 Disney film" , "Dope" , "Disney classic of 1941" , "Stupid person" , "1941 film about a young circus elephant born with large ears" .)

I've seen this clue in The Times.
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