The phrase "a somewhat narrower" is correct and usable in written English.
It can be used when describing something that is slightly less wide or broad than something else.
Example: "The new design features a somewhat narrower frame, making it more suitable for smaller spaces."
Alternatives: "a slightly narrower" or "a somewhat reduced width".
East by a somewhat narrower margin.
As Clinton told students at New England College in Henniker this weekend: "I do have a somewhat narrower path that I try to walk".
And even when the court actually quashes a subpoena, prosecutors can come back with a somewhat narrower one that still seeks a huge volume of records.
It is to be distinguished from citizenship, a somewhat narrower term that is sometimes used to denote the status of those nationals who have full political privileges.
Senator James Inhofe, the Oklahoma Republican who called global warming the "greatest hoax ever perpetrated on the American people," has unveiled a somewhat narrower bill to undercut the E.P.A.'s authority to regulate carbon dioxide.
The protons have a somewhat narrower energy distribution as compared to further upstream in the magnetosheath (point 5).
This would give any future investigation a somewhat narrow mandate: aiming only at C.I.A. officers who carried out abuses that exceed the interrogation guidelines.
Yet I can't help but feel that the initial conversation assumed a somewhat narrow idea of friendship, and I was a little perplexed by the definition of "likability" that emerged for describing books and the characters who populate them.
Good vases for flowers tend to share certain traits: among them, a somewhat narrow neck, for holding flowers upright, and a largish bottom that provides a stable base and allows stems to branch outward.
The actor, best known for her role in the Twilight series, said any business as old as the film industry was going to have a "somewhat narrow view" but that it was "expanding quickly, on so many levels".
