Song about Zulu being indolent (4)
I believe the answer is:
lazy
'indolent' is the definition.
(I know that indolent can be written as lazy)
'song about zulu' is the wordplay.
'song' becomes 'lay' (lay is a kind of song).
'about' is an insertion indicator.
'zulu' becomes 'Z' (phonetic alphabet: alpha, bravo, charlie etc.).
'lay' enclosing 'z' is 'LAZY'.
'being' acts as a link.
(Other definitions for lazy that I've seen before include "Averse to exertion" , "Idle - indolent" , "avoiding work" , "Averse to labour" , "Disinclined to work" .)