Fantastic score of course! (5)

I believe the answer is:

eagle

I'm a little stuck... Click here to teach me more about this clue!

'fantastic score' is the definition.
'eagle' can be an answer for 'score' (eagle is a kind of score). I'm not certain of the 'fantastic' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for eagle that I've seen before include "might one be bald?" , "Symbolic bird of the US" , "Aglee (anag.)" , "two strokes fewer?" , "Avian symbol of power" .)

I've seen this clue in The Sun.

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