One I form out of uniformity (5)

I believe the answer is:

unity

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'uniformity' is the definition.
(thesaurus)

'one i form out' is the wordplay.
'one' becomes 'unit' (synonyms).
'i form out' becomes 'y' (I can't justify this - if you can you should believe this answer much more).
'unit'+'y'='UNITY'

'of' is the link.

Can you help me to learn more?

(Other definitions for unity that I've seen before include "One - mutual agreement" , "Concord" , "Completeness (with nothing wanting)" , "Accord" , "State of being joined as a whole" .)

I've seen this clue in The Irish News.

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