Agreed over leg measurement in turn up (2,3,4)
I believe the answer is:
of one mind
'agreed' is the definition.
(I've seen this before)
'over leg measurement in turn up' is the wordplay.
I cannot really understand how this works, but
'over' could be 'on' (physically on top of) and 'on' is present in the answer.
'measurement' could be 'm' (M is an example) and 'm' is present in the answer.
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for of one mind that I've seen before include "Sharing an opinion" , "Unanimous" , "In accord" , "In agreement" , "Agreed" .)