Determined those people will accept alternative work on collections? (3,6)
I believe the answer is:
set theory
'work on collections?' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'determined those people will accept alternative' is the wordplay.
'determined' becomes 'set' (synonyms).
'those people' becomes 'they' ('they' refers to a group of people).
'will accept' indicates putting letters inside.
'alternative' becomes 'or'.
'they' placed around 'or' is 'theory'.
'set'+'theory'='SET THEORY'
Can you help me to learn more?
(Another definition for set theory that I've seen is " Cantor started this".)