The phrase "able to grasp a" is correct and usable in written English.
It can be used when discussing someone's capacity to understand or comprehend something, often in an educational or cognitive context.
Example: "She is able to grasp a complex concept quickly, which makes her an excellent student."
Alternatives: "capable of understanding a" or "able to comprehend a".
"There's great appeal in being able to grasp a world in its totality".
No longer able to grasp a plectrum with his right hand, he adapted by striking the strings with his thumb.
By curling her trunk in an ingenious way, Anna Mae was able to grasp a check for $10 and present it to Ass.
Coach Kelly started on this level, and being around and being at different colleges, I'm sure he was able to grasp a certain conformability rate with players and parents and recruits".
It was hard not to be intrigued by the idea that with the right data and the right mathematical formula, a computer might be able to grasp a person's preferences better than friends and family, suggesting books or movies that the consumer would not have discovered otherwise.
One may no longer be able to grasp a rope or rescue hoist".
But more important, so few of the people who go on this show are able to grasp that a lasting relationship is comprised of more than just hot make-out sessions in the ocean and helicopters and fantasy suites.
Without knowing how industries are interconnected with one another, no one should be able to grasp how an environmental restriction imposed on an industry affects other industries directly or indirectly and what the final result would be.
In so doing we are able to grasp conceptually, through a kind of detour, a whole that cannot be grasped through concepts in a direct fashion.
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So far she is a cleaning lady, but she plans to graduate from evening school in order to obtain a certificate and to be able to grasp skills in a hairdresser profession.
