Percentage of quota cut (5)
I believe the answer is:
ratio
'percentage' is the definition.
(thesaurus)
'quota cut' is the wordplay.
'quota' becomes 'ration' (I've seen this before).
'cut' means to remove the last letter.
'ration' with its final letter removed is 'RATIO'.
'of' is the link.
(Other definitions for ratio that I've seen before include "Correlation" , "Proportional measure" , "five to four, perhaps" , "Proportion, relationship" , "3 relation" .)