Crossword Genius

Outside, shunning cross, but immortal (7)

Ross

I believe the answer is:

eternal

'immortal' is the definition.
(similar in meaning)

'outside shunning cross' is the wordplay.
'outside' becomes 'external' (similar in meaning).
'shunning' suggests deleting specific letters.
'cross' becomes 'x' (an X is a cross).
'external' with 'x' taken away is 'ETERNAL'.

'but' acts as a link.

(Other definitions for eternal that I've seen before include "Ceaseless" , "Never-ending, existing always" , "Perpetual" , "Forever, never-ending" , "One being forever" .)

I've seen this clue in The Sun.
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