Get the letter off (5)

I believe the answer is:

erase

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This could be a double definition.

'get the letter' is the first definition.
'erase' can be an answer for 'get' (thesaurus). I am not sure about the 'the letter' bit.

'off' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for erase that I've seen before include "Put out of mind" , "Remove, wipe out" , "Kill" , "Rub out, cancel" , "Remove from memory" .)

I've seen this clue in the Evening Standard.

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