Lovely song and dance in front of half-hearted crowd (8)
I believe the answer is:
adorable
'lovely' is the definition.
(synonyms)
'song and dance in front of half-hearted crowd' is the wordplay.
'song and dance' becomes 'ado' (both can mean a commotion or fuss).
'in front of' is a charade indicator (letters next to each other) (some letters go in front of others).
'half' becomes 'ble' (I can't justify this - if you can you should give a lot more credence to this answer).
'hearted' says to take the centre.
'crowd' becomes 'cram' (I've seen this in another clue).
The middle letters of 'cram' are 'ra'.
'ble' put after 'ra' is 'rable'.
'ado'+'rable'='ADORABLE'
Can you help me to learn more?
(Other definitions for adorable that I've seen before include "sweet" , "Attractive - captivating" , "'Lovable, delightful (8)'" , "fetching" , "Such as excites loving admiration" .)