Colour that's in, in inn in France (9)
I believe the answer is:
aubergine
'colour' is the definition.
(I've seen this before)
'in in inn in france' is the wordplay.
'in' means one lot of letters goes inside another.
'inn in france' becomes 'auberge'.
'in' put within 'auberge' is 'AUBERGINE'.
'that's' is the link.
(Other definitions for aubergine that I've seen before include "Purple vegetable" , "Vegetable strangely found in a burgee" , "Edible plant" , "I argue, Ben, that it's a fruit" , "Fruit of the eggplant" .)