Create an ACL to make a record visible to only those users who belong to the assignment group

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I want to create an ACL which restricts a record from all those users who are not a part of the group defined in the assignment group field. Therefore, if a user is part of the current group mentioned in the assignment group field he should be able to write on the record else the record should be read-only for him.

[Ishaan Shoor]

You can select the type & operation as per your requirement. 

Demystifying Access Controls | ACL Basics

ACL Rule Types 

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I used 'write' operation , specified a role & condition but still the user is able to edit the record/.

Something like this !

I see that there is another ACL that provides Write access to the users having this role but would it make any difference? As in the ACL i created theres a condition also defined along with a role!