Crossword Genius

Proposition toff with mournful tone (8)

Ross

I believe the answer is:

plangent

'with mournful tone' is the definition.
(plangent can mean sounding mournful)

'proposition toff' is the wordplay.
'proposition' becomes 'plan' (a plan is a proposition or idea).
'toff' becomes 'gent' (I've seen this in another clue).
'plan'+'gent'='PLANGENT'

(Other definitions for plangent that I've seen before include "Resonant, reverberating with mournful sound" , "Loud and unhappy" , "booming" , "Loud and sad" , "Of sounds, resonant and reverberating" .)

I've seen this clue in The Guardian.
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