Her uniform may be tiny (5)

I believe the answer is:

unity

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

'uniform may be tiny' is the wordplay.
'uniform' becomes 'u' (phonetic alphabet: alpha, bravo, charlie etc.).
'may be' indicates anagramming the letters.
'tiny' with letters rearranged gives 'nity'.
'u'+'nity'='UNITY'

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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