Eusebio’s header fired up final for George Best (5)

I believe the answer is:

elite

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'best' is the definition.
(elite can mean the very best of a group)

'eusebio's header fired up final for george' is the wordplay.
'header' indicates taking the first letters (in a down clue, the letter at the top of the word).
'fired up final for george' becomes 'lite' (I am not sure about this - if you are sure you should believe this answer much more).
The initial letter of 'eusebio' is 'e'.
'e'+'lite'='ELITE'

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(Other definitions for elite that I've seen before include "Identified as the best" , "Chosen ones" , "First-class" , "Upper crust" , "top drawer?" .)

I've seen this clue in The Sunday Times.

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