A capital group of players as well (4)

I believe the answer is:

also

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'as well' is the definition.
(synonyms)

'a capital group of players' is the wordplay.
'capital group of players' becomes 'lso' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'lso'='ALSO'

Can you help me to learn more?

(Other definitions for also that I've seen before include "an indication of more to come" , "Plus" , "Item" , "Furthermore" , "admitted to Royal Society > too" .)

I've seen this clue in The Independent.

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