Small amount earned from singer, I hear (6)
I believe the answer is:
tenner
'small amount earned' is the definition.
(informal term for ten pounds)
'singer i hear' is the wordplay.
'singer' becomes 'tenor' (tenor is a kind of singer).
'i hear' indicates a 'sounds like' (homophone) clue.
'tenor' sounds like 'TENNER'.
'from' acts as a link.
(Other definitions for tenner that I've seen before include "Note featuring Charles Darwin?" , "Ten-pound note (inf.)" , "Note - sounds like singer" , "UK banknote" , "Cash note" .)