Prepared to be persuaded not to measure (5,4)
I believe the answer is:
ready made
'prepared' is the definition.
(thesaurus)
'persuaded not to measure' is the wordplay.
I cannot quite understand how this works, but
'measure' could be 'ma' (mA is a kind of measure) and 'ma' is found in the answer.
This explanation may well be incorrect...
'to be' acts as a link.
Can you help me to learn more?
(Other definitions for ready made that I've seen before include "off-the-peg garment" , "Duchamp piece" , "beautifully suited" , "Needing no preparation" , "may be ideally suited" .)