Layabout navigator dribbling from the mouth? (10)

I believe the answer is:

slobbering

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'dribbling from the mouth?' is the definition.
The definition and answer can be both related to bodily activities as well as being present participle verbs.
Perhaps you can see an association between them that I don't see?

'layabout navigator' is the wordplay.
'layabout' becomes 'slob' (both can mean a lazy person).
'navigator' becomes 'bering' (I am not sure about this - if you are sure you should believe this answer much more).
'slob'+'bering'='SLOBBERING'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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