Limit short correspondence (5)
I believe the answer is:
ratio
'correspondence' is the definition.
(thesaurus)
'limit short' is the wordplay.
'limit' becomes 'ration' (rationing is a kind of limiting).
'short' means to remove the last letter.
'ration' with its last letter removed is 'RATIO'.
(Other definitions for ratio that I've seen before include "Measure expressed as a proportion" , "Relationship of numbers" , "Relativity between two quantities" , "Proportional relationship" , "Relation between two things, numbers say" .)