Crossword Genius

Honest to a T and full of compassion (8)

Ross

I believe the answer is:

truthful

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'honest' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

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(Other definitions for truthful that I've seen before include "Honest; not lying" , "Right!" , "Veracious, accurate" , "Candid, open" , "unlikely to make up" .)

I've seen this clue in the Sydney Morning Herald.
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