Crossword Genius

Major sale is quite a thing (3,4)

Ross

I believe the answer is:

big deal

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

'quite a thing' is the definition.
I can't tell whether this definition defines the answer.

'major sale' is the wordplay.
'major' becomes 'big' (I've seen this in other clues).
'sale' becomes 'deal' (I can't justify this - if you can you should believe this answer much more).
'big'+'deal'='BIG DEAL'

'is' is the link.

Can you help me to learn more?

(Other definitions for big deal that I've seen before include "Handing out lots of cards" , "doesn't impress me at all" , "Scornful response to boast (colloq.)" , "In slang, I'm not impressed - by large wood?" , "sarcastic response" .)

I've seen this clue in The Mirror.
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