Crossword Genius

... Frank may be the son going astray (6)

Ross

I believe the answer is:

honest

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

'the son going astray' is the wordplay.
'going astray' indicates anagramming the letters.
'the'+'son'='theson'
'theson' with letters rearranged gives 'HONEST'.

'may be' acts as a link.

(Other definitions for honest that I've seen before include "Honorable, true" , "Not lying" , "Truthful and trustworthy" , "Fair and just, not crooked" , "Truthful and dependable" .)

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