Crossword Genius

A great looming shifting mass (13)

Ross

I believe the answer is:

agglomeration

'mass' is the definition.
(thesaurus)

'a great looming shifting' is the wordplay.
'shifting' is an anagram indicator.
'great'+'looming'='greatlooming'
'greatlooming' with letters rearranged gives 'gglomeration'.
'a'+'gglomeration'='AGGLOMERATION'

(Other definitions for agglomeration that I've seen before include "assemblage" , "Clump" , "Great Mongolia (anag) - mass or collection of things" .)

I've seen this clue in The Sunday Times.
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