Crossword Genius

After moving, girl at hand to pack up, finally (5,2,1,4)

Ross

I believe the answer is:

grind to a halt

I'm a little stuck... Click here to teach me more about this clue!

'pack up finally' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'after moving girl at hand to' is the wordplay.
'girl at hand to' can be anagrammed to 'GRIND TO A HALT'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for grind to a halt that I've seen before include "Cease to make progress" , "Slow to a standstill" , "Slow gradually, then stop completely" , "Come to a standstill" , "Gradually cease moving" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app