Crossword Genius

If so, loser becomes poser, in a manner of speaking (4)

Ross

I believe the answer is:

lisp

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

'speaking' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lisp that I've seen before include "Non-standard pronunciation" , "Have difficulty pronouncing `s'" , "Thpeak like thith" , "Speak with defective sibilants" , "Slip into speech defect" .)

I've seen this clue in The Guardian.
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