Hue of most interest (4)
I believe the answer is:
'hue' is the definition.
(tint is a kind of colour)
'of most interest' is the wordplay.
'of' says the answer is hidden in the clue.
'TINT' is hidden in the letters of 'most interest'.
(Other definitions for tint that I've seen before include "Quality of colour" , "Hue, shade" , "work for coiffeuse?" , "(Softer variety of) colour" , "'Shade, tone (4)'" .)