A singular gesture brings delegate (6)
I believe the answer is:
assign
'delegate' is the definition.
('assign' can be a synonym of 'delegate')
'a singular gesture' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'gesture' becomes 'sign' (signing is a kind of gesturing**).
'a'+'s'+'sign'='ASSIGN'
'brings' is the link.
(Other definitions for assign that I've seen before include "Allocate (a task or duty)" , "Allot, fix, appoint" , "Appoint or ascribe." , "Allocate; designate" , "Set aside for a specific purpose" .)