Sporting groups in university coming in for a little soccer, initially (9)

'sporting groups' is the definition.
The definition and answer can be both groups as well as being plural nouns.
Maybe there's a link between them I don't understand?

'in university coming in for a little soccer initially' is the wordplay.
'in' means one lot of letters goes inside another.
'university' becomes 'U' (abbreviation for university).
'coming in' indicates putting letters inside.
'a little' indicates taking the first letters.
'initially' becomes 'some' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letter of 'soccer' is 's'.
'for'+'s'='fors'
'u' put into 'fors' is 'fours'.
'fours' placed around 'some' is 'FOURSOMES'.

Can you help me to learn more?