Crossword Genius

Very full of cracks, is jet ok to fly? (7)

Ross

I believe the answer is:

jokiest

'very full of cracks' is the definition.

'is jet ok to fly?' is the wordplay.
'to fly?' indicates anagramming the letters (I've seen 'flies' mean this).
'is'+'jet'+'ok'='isjetok'
'isjetok' anagrammed gives 'JOKIEST'.

I've seen this clue in The Times.
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