Turn up with right band, sounding pleased (7)
I believe the answer is:
purring
'sounding pleased' is the definition.
I can't tell whether this definition defines the answer.
'turn up with right band' is the wordplay.
'turn' says the letters should be written in reverse.
'with' says to put letters next to each other.
'right' becomes 'r' (common abbreviation).
'band' becomes 'ring' (a ring is a band of metal).
'up' back-to-front is 'pu'.
'pu'+'r'+'ring'='PURRING'
Can you help me to learn more?
(Another definition for purring that I've seen is " Sounding like happy cat".)