Crossword Genius

Having a bit of an impediment, not strong (3)

Ross

I believe the answer is:

dim

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'strong' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I can't see?

'having a bit of an impediment not' is the wordplay.
'DIM' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for dim that I've seen before include "Not bright or distinct" , "Unintelligent; badly lit" , "Providing little light" , "Not bright, literally or mentally" , "Gloomy; dull" .)

I've seen this clue in the Evening Standard.
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