Urges some simple alterations (6)

I believe the answer is:

impels

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

'urges' is the definition.
(I've seen this before)

'some simple alterations' is the wordplay.
'simple' can be anagrammed to 'IMPELS'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for impels that I've seen before include "Drives on in simple way" , "Urges forward" , "Spurs" , "Forces, urges to action" , "Urges or drives to do something" .)

I've seen this clue in The Globe and Mail.

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