Dish from canteen is absent-mindedly overturned (5)
I believe the answer is:
basin
'dish' is the definition.
(I know that basin is a type of wash basin)
'from canteen is absent-mindedly overturned' is the wordplay.
'from' indicates the answer is hidden within the clue.
'overturned' is a reversal indicator.
'nisab' is hidden in the letters of 'canteen is absent mindedly'.
'nisab' reversed gives 'BASIN'.
(Other definitions for basin that I've seen before include "Round open dish for water" , "Depression in the earth's surface" , "Water receptacle" , "requirement for cleansing" , "Kitchen vessel" .)