Number sent there (5)
I believe the answer is:
three
'number' is the definition.
(three is a number)
'sent there' is the wordplay.
'sent' indicates an anagram (send can mean to excite or stimulate).
'there' anagrammed gives 'THREE'.
(Other definitions for three that I've seen before include "Figure" , "trilogy" , "Number of feet in a yard" , "Cardinal number" , "One, one, one" .)