Plunge in to get submerged. It's simply lovely (6)

I believe the answer is:

divine

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'submerged it's simply lovely' is the definition.
I can't judge whether this definition defines the answer.

'plunge in to get' is the wordplay.
'plunge' becomes 'dive' (synonyms).
'to get' indicates putting letters inside.
'dive' enclosing 'in' is 'DIVINE'.

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(Other definitions for divine that I've seen before include "Of or coming from God" , "of a splendid nature" , "Godly or celestial" , "Search for water with a rod" , "clergyman" .)

I've seen this clue in the Evening Standard.

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