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' is an anagram indicator.
'the'+'son'='theson'
'theson' is an anagram of 'HONEST'.

'may be' acts as a link.

(Other definitions for honest that I've seen before include "See 1", "Virtuous", "Law-abiding", "Genuine and trustworthy", "really!".)

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