Effectively designed to make comer go in (9)
I believe the answer is:
ergonomic
'effectively designed' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives occasionally define each other.
'make comer go in' is the wordplay.
'make' indicates anagramming the letters.
'comer'+'go'+'in'='comergoin'
'comergoin' with letters rearranged gives 'ERGONOMIC'.
'to' is the link.
Can you help me to learn more?
(Other definitions for ergonomic that I've seen before include "Studying man in his work environment" , "Well-designed" , "Designed for efficiency and comfort in the working environment" , "Maximising efficiency" , "Designed for work efficiency" .)