Crossword Genius

Eternally is always extra (8)

Ross

I believe the answer is:

evermore

'eternally' is the definition.
(synonyms)

'always extra' is the wordplay.
'always' becomes 'ever' (synonyms).
'extra' becomes 'more' (both can mean additional).
'ever'+'more'='EVERMORE'

'is' is the link.

(Other definitions for evermore that I've seen before include "Always and without end" , "For which, permanently" , "Eternally" , "Always, forever" , "To all eternity" .)

I've seen this clue in The Mirror.
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