Aimed for new measurements (6)
I believe the answer is:
dieted
'aimed for new measurements' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dieted that I've seen before include "Lost weight" , "Aimed to lose weight" , "Regulated one's food consumption" , "Went on strict food regime" , "Went on controlled food regime" .)