Support, say, dessert being served with beers (10)

I believe the answer is:

aftersales

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

'support' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'dessert being served with beers' is the wordplay.
'dessert' becomes 'afters' (afters can mean a dessert course).
'being served with' says to put letters next to each other.
'beers' becomes 'ales' (ale is a type of beer).
'afters'+'ales'='AFTERSALES'

'say' acts as a link.

Can you help me to learn more?

(Another definition for aftersales that I've seen is " Follow up service".)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app