Voice disapproval with saint giving help (5)
I believe the answer is:
boost
'help' is the definition.
(I know that boost is a type of help)
'voice disapproval with saint' is the wordplay.
'voice disapproval' becomes 'boo' (to boo is to express disapproval).
'with' says to put letters next to each other.
'saint' becomes 'st' (abbreviation).
'boo'+'st'='BOOST'
'giving' acts as a link.
(Other definitions for boost that I've seen before include "lift" , "Give more impetus to" , "Promote" , "Push up (eg morale, chances)" , "Raise" .)