Send mum one pound (4)

I believe the answer is:

mail

'send' is the definition.
(I know that mail is a more specific form of the action send)

'mum one pound' is the wordplay.
'mum' becomes 'ma' (both can mean mother).
'one pound' becomes 'Il'.
'ma'+'il'='MAIL'

(Other definitions for mail that I've seen before include "Armour; posted items" , "Post in America" , "Dispatch - armour" , "American post from Lima" , "Paper" .)

I've seen this clue in The Sun and The Telegraph.

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