Special beers, sarnies etc melted antipathy of customers? (5,10)

I believe the answer is:

sales resistance

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'antipathy of customers?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'special beers sarnies etc melted' is the wordplay.
'special' becomes 'S' (common abbreviation as in Special Air Service).
'beers' becomes 'ales' (I've seen this before).
'melted' indicates an anagram.
'sarnies'+'etc'='sarniesetc'
'sarniesetc' anagrammed gives 'resistance'.
's'+'ales'+'resistance'='SALES RESISTANCE'

Can you help me to learn more?

(Other definitions for sales resistance that I've seen before include "Opposition shown to rep" , "Reluctance to buy" .)

I've seen this clue in The Daily Mail.

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