Crossword Genius

Exercise for us at closing time (3)

Ross

I believe the answer is:

use

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

'exercise' is the definition.
(I know that exercise is a kind of the use)

'us at closing time' is the wordplay.
'at' says to put letters next to each other.
'closing time' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'us'+'e'='USE'

'for' is the link.

Can you help me to learn more?

(Other definitions for use that I've seen before include "Operate" , "Exploit; custom" , "Apply, employ" , "Milk" , "Put to work" .)

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