Crossword Genius

Moral objection against people crossing sea being sent back (12)

Ross

I believe the answer is:

condemnation

I'm a little stuck... Click here to teach me more about this clue!

'sea being sent back' is the definition.
I can't tell whether this defines the answer.

'moral objection against people crossing' is the wordplay.
'moral objection' becomes 'dem' (I am not sure about this - if you are sure you should believe this answer much more).
'against' becomes 'con' (as in pros and cons, for and against).
'people' becomes 'nation'.
'crossing' means one lot of letters goes inside another (to cross can mean to go over or around).
'con'+'nation'='connation'
'dem' put within 'connation' is 'CONDEMNATION'.

Can you help me to learn more?

(Other definitions for condemnation that I've seen before include "Complete disapproval" , "criticism" , "Censure" .)

I've seen this clue in The Independent.
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