Payload transported by a fighter (7)

I believe the answer is:

freight

I'm a little stuck... Click here to teach me more about this clue!

'payload' is the definition.
(I know that payload can be written as freight)

'transported by a fighter' is the wordplay.
'fighter' can be anagrammed to 'FREIGHT'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for freight that I've seen before include "that's carried by rail and road" , "Something carried" , "Goods carried by a large vehicle" , "Consignment" , "Cargo, goods transported" .)

I've seen this clue in the Evening Standard.

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