Crossword Genius

Mug delivering relief? (6)

Ross

I believe the answer is:

sucker

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

This might be a double definition.

'mug' is the first definition.
(I know that mug can be written as sucker)

'relief?' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'delivering' acts as a link.

Can you help me to learn more?

(Other definitions for sucker that I've seen before include "Shoot growing from roots or person easily deceived" , "One easily fooled; base-of-stem shoot" , "Plant shoot; gullible type" , "baby?" , "Shoot from underground stem, or slangy victim" .)

I've seen this clue in The Independent.
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