Instruction for division from yank – literally 3 over 3's helping to begin with (5-4,4)
I believe the answer is:
three-line whip
'instruction for division' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'from yank literally 3 over 3's helping to begin with' is the wordplay.
I cannot really see how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
'3' could be 'three' (synonyms) and 'three' is located in the answer.
'with' could be 'w' (short for with) and 'w' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for three-line whip that I've seen before include "Urgent call to vote" , "Important instruction to MPs" , "Firm instruction to voting MPs" , "Parliamentary voting instruction" , "Demand for MP's vote" .)