Crossword Genius

More diffident heirs relaxed (5)

Ross

I believe the answer is:

shier

'more diffident' is the definition.
('shy' can be a synonym of 'diffident')

'heirs relaxed' is the wordplay.
'relaxed' indicates anagramming the letters.
'heirs' anagrammed gives 'SHIER'.

I've seen this clue in The Guardian.
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