Crossword Genius

Insect's disgusting inside, to be honest (7)

Ross

I believe the answer is:

frankly

'to be honest' is the definition.
('frankly' can be a synonym of 'to be honest')

'insect's disgusting inside' is the wordplay.
'insect' becomes 'fly' (fly is a kind of insect).
'disgusting' becomes 'rank'.
'inside' indicates putting letters inside.
'fly' placed around 'rank' is 'FRANKLY'.

I've seen this clue in The Times.
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