Had a handicap, in a manner of speaking (9)

I believe the answer is:

stammered

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'had' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for stammered that I've seen before include "struggled to speak" , "Spoke haltingly" .)

I've seen this clue in The Irish News.

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