Group donated hot sum - he is the one not agreeing (3,3,3,3,3)

'group donated' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'hot sum he is the one not agreeing' is the wordplay.
I cannot quite understand how this works, but
'hot' could be 'h' (abbreviation eg on taps) and 'h' is located in the answer.
'he' could be 'theo' and 'theo' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?