Crossword Genius

Open tin was sufficient (6)

Ross

I believe the answer is:

candid

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'open' is the definition.
(I know that open can be written as candid)

'tin was sufficient' is the wordplay.
'tin' becomes 'can' (synonyms).
'was sufficient' becomes 'did' (I can't explain this - if you can you should believe this answer much more).
'can'+'did'='CANDID'

Can you help me to learn more?

(Other definitions for candid that I've seen before include "Truthful, frank" , "Frank - and CID (anag)" , "Very clear" , "Free and frank" , "Impartial" .)

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