Crossword Genius

Gets on and leaves top off (4)

Ross

I believe the answer is:

ages

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

'gets on' is the definition.
(get on can mean to get older)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ages that I've seen before include "A long time (colloq.)" , "Gets older" , "Epochs" , "Rock of - - (hymn)" , "Historical eras" .)

I've seen this clue in The Guardian.
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