Blubber lines seal, having an innate tendency to be clumsy (12)

I believe the answer is:

lubberliness

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'innate tendency to be clumsy' is the definition.
I can't judge whether this definition defines the answer.

'blubber lines seal having' is the wordplay.
'having' says the answer is hidden in the clue.
'LUBBERLINESS' can be found hidden inside 'blubber lines seal'.

'an' acts as a link.

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