Crossword Genius

The sound of a French river - that's reasonable (4)

Ross

I believe the answer is:

sane

'reasonable' is the definition.
(I know that reasonable can be written as sane)

'the sound of a french river' is the wordplay.
'the sound of' shows a homophone (sound like).
'a french river' becomes 'seine' (I've seen this before).
'seine' sounds like 'SANE'.

'that's' acts as a link.

(Other definitions for sane that I've seen before include "Mentally healthy" , "Healthy in mind" , "Mentally sound" , "Not mad" , "In full possession of mental faculties" .)

I've seen this clue in The Irish Independent.
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