Crossword Genius

Film about origins of Game of Thrones includes series' number one fan? (7)

Ross

I believe the answer is:

egotist

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'number one fan?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'film about origins of game of thrones includes series'' is the wordplay.
'film' becomes 'et' (E.T. the Extra-Terrestrial).
'about' indicates putting letters inside.
'origins of' suggests taking the first letters.
The initial letters of 'game of thrones includes series' is 'gotis'.
'et' going around 'gotis' is 'EGOTIST'.

Can you help me to learn more?

(Other definitions for egotist that I've seen before include "Self-conceited person" , "Boastful person" , "Excessively conceited person" , "A self-absorbed and conceited person" , "braggart" .)

I've seen this clue in The Independent.
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