Starting tomorrow, get ahead at high speed (3)

I believe the answer is:

ton

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'high speed' is the definition.
'ton' can be an answer for 'speed' (I've seen this before). I am not sure about the 'high' bit.

'starting tomorrow get ahead' is the wordplay.
'starting' suggests taking the first letters.
'get' means one lot of letters go next to another.
'ahead' becomes 'on' (synonyms).
The initial letter of 'tomorrow' is 't'.
't'+'on'='TON'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for ton that I've seen before include "20cwt" , "Century" , "A slang 100 mph" , "1000 kilos" , "Fashionable" .)

I've seen this clue in the Evening Standard.

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