In a deep depression, covered with baby's saliva (7)

I believe the answer is:

abyssal

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'in a deep depression covered' is the definition.
I can't tell whether this definition defines the answer.

'with baby's saliva' is the wordplay.
'with' says the answer is hidden in the clue.
'ABYSSAL' is hidden within 'babys saliva'.

Can you help me to learn more?

(Other definitions for abyssal that I've seen before include "Bottomless" , "Belonging to ocean depths" , "on the bed" , "regarding ocean trenches?" .)

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