In Tenerife we stay least of all (6)
I believe the answer is:
fewest
'least of all' is the definition.
(with the fewest of smallest amount)
'in tenerife we stay' is the wordplay.
'in' indicates a hidden word.
'FEWEST' is hidden in the letters of 'tenerife we stay'.
(Other definitions for fewest that I've seen before include "most opposite" , "Minimum number" , "The least number" , "Lowest figure" , "The lowest number" .)