We help in their shambolic call to vote (5-4,4)
I believe the answer is:
three-line whip
'call to vote' is the definition.
(type of instruction to vote in parliament)
'we help in their shambolic' is the wordplay.
'shambolic' indicates an anagram.
'we'+'help'+'in'+'their'='wehelpintheir'
'wehelpintheir' anagrammed gives 'THREE-LINE WHIP'.
(Other definitions for three-line whip that I've seen before include "Parliamentary voting instruction" , "Urgent call to vote" , "Important instruction to MPs" , "Firm instruction to voting MPs" , "Demand for MP's vote" .)