"define more clearly" is a correct and usable phrase in written English.
You can use it when you want to ask someone to provide more information or details about something. For example, if someone was describing a process but you didn't understand, you might ask them to "define more clearly" what they are talking about.
I want to define more clearly what Burberry is".
The government needed to define more clearly what banking services it wanted to ringfence.
With twice as many personalities in the office, the three managers wanted to define more clearly their own roles.
Minutes after Bush flew away, however, reporters asked senior Bush staffers to define more clearly the mission that Bush had deemed accomplished.
It's hard to conceive of two articles that could define more clearly the difference between the music world then and now.
The president's call to define "more clearly the duties of C.E.O.'s with respect to accounting and disclosure appears appropriate," Mr. Greenspan said.
This paper examines some of the simpler ones that are defined more clearly in terms of easily measurable mechanical properties.
In the first quarter, the actual budget surplus was 2.2% of annualised GDP.The government is defining more clearly how it will use the surplus.
Although some smells need to be defined more clearly, smell detection provides a helpful means to support quality assurance in requirements engineering, for instance, as a supplement to reviews.
This model deepens the empirical findings by defining more clearly the memory mechanisms involved in generating the basic representation types, and by positing a theory of interaction between these types based on ACT-R's associative declarative memory.
Mayor Michael R. Bloomberg welcomed news of the law's passage, saying in a statement that by defining more clearly what a hotel is, the law will help the city "take enforcement action against illegal hotels".
