Frank, the son, was converted (6)

I believe the answer is:

honest

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

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

'the son was converted' is the wordplay.
'the son' anagrams to 'HONEST'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for honest that I've seen before include "'Fair-dealing, upright (6)'" , "Truthful and trustworthy" , "Frank" , "Reliable - the son (anag)" , "Honorable, true" .)

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

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