One meant to receive tablets gets through Red Sea with God's backing, somehow (9)
I believe the answer is:
addressee
'one meant to receive' is the definition.
(intended recipient)
'tablets gets through red sea with god's backing somehow' is the wordplay.
I cannot really see how this works, but
'tablets' could be 'es' (E can refer to an ecstasy tablet) and 'es' is present in the answer.
'red' could be 'r' (I've seen this in other clues) and 'r' is located in the answer.
'god's' could be 'ds' (abbreviation in various Latin phrases) and 'ds' is found in the leftover letters.
The remaining letters 'adee' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for addressee that I've seen before include "He gets a letter" , "One contacted" , "Person named on an envelope" , "Recipient of post" , "The person to whom letter is delivered" .)