Trained nice moose to make savings (9)
I believe the answer is:
economise
'make savings' is the definition.
(I've seen this before)
'trained nice moose' is the wordplay.
'trained' is an anagram indicator (to train can mean to grow something into a shape).
'nice'+'moose'='nicemoose'
'nicemoose' anagrammed gives 'ECONOMISE'.
'to' is the link.
(Other definitions for economise that I've seen before include "budget" , "Cut back on expenses, be thrifty" , "cut costs" , "Make savings" , "make cuts" .)