To a new leader, it can be a burden (3)

I believe the answer is:

ton

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'it can be a burden' is the definition.
The definition suggests a singular noun which matches the answer.

'to a new leader' is the wordplay.
'leader' says to take the initial letters.
The initial letter of 'new' is 'n'.
'to'+'n'='TON'

Can you help me to learn more?

(Other definitions for ton that I've seen before include "Heavy weight or 100mph" , "20cwt" , "A slangy 100 mph - heavy" , "Style" , "A slangy 100mph - heavy going" .)

I've seen this clue in the Evening Standard.

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