Is that the full clue? SINGE is "burn a little" and a "singer" could be ratting on confederates, but there is no clue for the R unless "little rat" is doing double duty (or it's a very poor effort at &lit)
Thank you all, I'll go with SINGER then...
… though that being said I still don't like it much as a SINNER could also be thought of as a rat and one who burns (ie in Hell!)