Staff on the plane wrote a song and boasted (7)
I believe the answer is:
aircrew
'staff on the plane wrote a' is the definition.
I can't judge whether this definition defines the answer.
'song and boasted' is the wordplay.
'song' becomes 'air' (I've seen this before).
'and' means one lot of letters go next to another.
'boasted' becomes 'crew' ('crew' is past tense of 'crow', meaning to boast).
'air'+'crew'='AIRCREW'
Can you help me to learn more?
(Other definitions for aircrew that I've seen before include "busy flier" , "Rice war? (anag)" , "Flight personnel" , "Those working on plane" , "Team manning aircraft" .)