Inclined to keep mostly dry in short (6)
I believe the answer is:
abrupt
'short' is the definition.
(I've seen this in another clue)
'inclined to keep mostly dry' is the wordplay.
'inclined to' becomes 'apt' (I've seen this in another clue).
'keep' indicates putting letters inside.
'mostly' means to remove the last letter.
'dry' becomes 'brut' (type of wine).
'brut' with its final letter taken away is 'bru'.
'apt' going around 'bru' is 'ABRUPT'.
'in' acts as a link.
(Other definitions for abrupt that I've seen before include "Rough and quick" , "Terse, curt" , "Curt and short" , "Curt; precipitous" , "Sudden and unexpected" .)