Love great end to Greek series (5)

I believe the answer is:

omega

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'end to greek series' is the definition.
I can't tell whether this defines the answer.

'love great' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'great' becomes 'mega' (I've seen this in other clues).
'o'+'mega'='OMEGA'

Can you help me to learn more?

(Other definitions for omega that I've seen before include "Last (Gk. letter)" , "Art of story-telling by body movement" , "Greek long 'o'" , "letter to Greeks" , "Last thing" .)

I've seen this clue in The Telegraph.

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