Phrase possibly carved over the tomb (6)

I believe the answer is:

seraph

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'carved over the tomb' is the definition.
I can't tell whether this definition defines the answer.

'phrase possibly' is the wordplay.
'possibly' is an anagram indicator.
'phrase' anagrammed gives 'SERAPH'.

Can you help me to learn more?

(Other definitions for seraph that I've seen before include "Phrase distorted for the heavenly being" , "Angel with winged head of child" , "Phrase for a lofty angel" , "Heavenly creature" , "Angelic character" .)

I've seen this clue in The Globe and Mail.

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