Like people who sing with some bands (5)
I believe the answer is:
human
'like people' is the definition.
(I've seen this before)
'sing with some bands' is the wordplay.
'sing' becomes 'hum' (humming is a kind of singing).
'with some bands' becomes 'an' (I can't explain this - if you can you should believe this answer much more).
'hum'+'an'='HUMAN'
'who' acts as a link.
Can you help me to learn more?
(Other definitions for human that I've seen before include "Of the species of homo sapiens" , "Like people" , "Relating to a person" , "Being that's apt to err?" , "Like a real person" .)