Crossword Genius

Massive shop baffling most agree (9)

Ross

I believe the answer is:

megastore

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

'massive shop' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'baffling most agree' is the wordplay.
'baffling' is an anagram indicator.
'most'+'agree'='mostagree'
'mostagree' with letters rearranged gives 'MEGASTORE'.

Can you help me to learn more?

(Other definitions for megastore that I've seen before include "giant in business" , "Very large shop" , "large outlet" , "Massive outlet" .)

I've seen this clue in The Times.
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