Crossword Genius

Slung out of Mulligans - what was the man of letters expecting? (4)

Ross

I believe the answer is:

mail

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

'slung out of mulligans what was the' is the definition.
I can't judge whether this defines the answer.

'man of letters expecting?' is the wordplay.
I cannot really see how this works, but
'man' could be 'm' and 'm' is present in the answer.
The remaining letters 'ail' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for mail that I've seen before include "Paper" , "Armour; posted items" , "Post or body armour" , "Letters and parcels" , "Post in America" .)

I've seen this clue in the Irish Times.
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