Latin rascal is not supported (4)

I believe the answer is:

limp

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'not supported' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can sometimes define each other.

'latin rascal' is the wordplay.
'latin' becomes 'l'.
'rascal' becomes 'imp' (synonyms).
'l'+'imp'='LIMP'

'is' is the link.

Can you help me to learn more?

(Other definitions for limp that I've seen before include "Hanging loosely - hobble" , "Walk with an injury" , "Floppy" , "Saggy and drooping" , "Not stiff or firm" .)

I've seen this clue in The Mirror.

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