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 defines the answer.

'blubber lines seal having' is the wordplay.
'having' indicates the answer is hidden within the clue.
'LUBBERLINESS' is hidden in the letters of 'blubber lines seal'.

'an' is the link.

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