Burden of love concealed by a swain (4)

I believe the answer is:

load

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'burden' is the definition.
(I know that burden can be written as load)

'love concealed by a swain' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'concealed by' indicates putting letters inside.
'a swain' becomes 'lad' (I am not sure about this - if you are sure you should believe this answer much more).
'o' going within 'lad' is 'LOAD'.

'of' is the link.

Can you help me to learn more?

(Other definitions for load that I've seen before include "Amount" , "Weigh down" , "Weight to be transported" , "Goods carried by a large vehicle" , "Charge a gun" .)

I've seen this clue in the Evening Standard.

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