Overburdened with a word (4)

I believe the answer is:

verb

'a word' is the definition.
(I know that verb is a type of content word)

'overburdened with' is the wordplay.
'with' indicates a hidden word.
'VERB' is hidden within 'overburdened'.

(Other definitions for verb that I've seen before include "Old-fashioned art, for example" , "'In grammar, it denotes action (4)'" , "Type of word indicating action" , "Maybe protest" , "Word that denotes an action or a state" .)

I've seen this clue in The Mirror.

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