Number of intentions (3)
I believe the answer is:
ten
'number' is the definition.
(ten is a kind of whole number)
'of intentions' is the wordplay.
'of' indicates a hidden word.
'TEN' can be found hidden inside 'intentions'.
(Other definitions for ten that I've seen before include "Figure" , "Half a score" , "How many" , "Roman numeral X" , "Five times two" .)