Did a job on the numbers for a grander model (8)
I believe the answer is:
arranged
'did' is the definition.
('arrange' can be a synonym of 'do')
'a grander model' is the wordplay.
'model' is an anagram indicator.
'grander' is an anagram of 'rranged'.
'a'+'rranged'='ARRANGED'
'a job on the numbers for' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for arranged that I've seen before include "Fixed" , "Scored" , "Organised, planned" , "Settled plans for something" , "Put in proper order" .)