An untruth about Victor being animated (5)
I believe the answer is:
alive
'being animated' is the definition.
(synonyms)
'an untruth about victor' is the wordplay.
'an' becomes 'a'.
'untruth' becomes 'lie' (lie is a kind of untruth).
'about' indicates putting letters inside.
'victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'lie' going around 'v' is 'live'.
'a'+'live'='ALIVE'
(Other definitions for alive that I've seen before include "Existent" , "Aware" , "Alert, active" , "Breathing, existing" , "surviving" .)