With heart, everybody backing white parrot (7)
I believe the answer is:
corella
'white parrot' is the definition.
The definition suggests a singular noun which matches the answer.
'with heart everybody backing' is the wordplay.
'with' is a charade indicator (letters next to each other).
'heart' becomes 'core' (synonyms).
'everybody' becomes 'all' (I've seen this before).
'backing' is a reversal indicator.
'all' written backwards gives 'lla'.
'core' next to 'lla' is 'CORELLA'.
Can you help me to learn more?
(Other definitions for corella that I've seen before include "antipodean flier" , "white bird" .)