Fail pious quest, regularly back boozing on this? (7)

I believe the answer is:

tequila

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'boozing on this?' is the definition.
The definition suggests a singular noun which matches the answer.

'fail pious quest regularly back' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'back' says the letters should be written in reverse.
'fail'+'pious'+'quest'='failpiousquest'
The alternate letters of 'failpiousquest' are 'aliuqet'.
'aliuqet' in reverse letter order is 'TEQUILA'.

Can you help me to learn more?

(Other definitions for tequila that I've seen before include "Quit ale for Mexican spirit" , "Mexican alcoholic drink" , "Mexican liquor made from agave" , "Is there another drink to equal it?" , "Cocktail -- 1988 American crime film -- equaliser units (anag)" .)

I've seen this clue in The Independent.

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