This Gaelic type, I see, is the making of a soccer side! (4)
I believe the answer is:
celt
'of a soccer side' is the definition.
The definition suggests a singular noun which matches the answer.
'this gaelic type i see is the' is the wordplay.
'this gaelic type i' becomes 'cel' (I can't justify this - if you can you should give a lot more credence to this answer).
'see is the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'cel'+'t'='CELT'
'making' is the link.
Can you help me to learn more?
(Other definitions for celt that I've seen before include "one who spoke Manx, for example" , "Early European" , "Early Briton" , "Pre-Roman inhabitant of Ireland and Britain" , "Ancient Briton" .)