Very enthusiastic as English tactics altered (8)

I believe the answer is:

ecstatic

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'very enthusiastic' is the definition.
I can't judge whether this definition defines the answer.

'english tactics altered' is the wordplay.
'english' becomes 'e' (abbreviation).
'altered' indicates an anagram.
'tactics' anagrammed gives 'cstatic'.
'e'+'cstatic'='ECSTATIC'

'as' is the link.

Can you help me to learn more?

(Other definitions for ecstatic that I've seen before include "in seventh heaven" , "Jubilant" , "Full of bliss" , "Emotionally exalted" , "Showing great delight" .)

I've seen this clue in The Times.

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