Charlie has strange optimism about king introducing solidarity and fellow feeling (9,6)

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

'charlie has strange optimism about king introducing solidarity' is the wordplay.
I cannot really see how this works, but
'charlie' could be 'c' (phonetic alphabet: alpha, bravo, charlie etc.) and 'c' is present in the answer.
'king' could be 'r' (r is abbreviation for rex) and 'r' is present in the answer.
'solidarity' could be 'unity' (I've seen this before) and 'unity' is present in the answer.
an anagram of 'optimism' is 'ommspiit' which is within the left over letters.
No letters remain.
This explanation may well be incorrect...

'and' acts as a link.

Can you help me to learn more?