Firm understanding (5)

I believe the answer is:

grasp

'firm understanding' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for grasp that I've seen before include "Seize - comprehend" , "Understand; hold tight" , "Understand; take in hand" , "Hold firmly; understand" , "Take hold of firmly" .)

I've seen this clue in The Washington Post and the Newsday.com.

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