Positive thinker to choose one film (8)
I believe the answer is:
optimist
'positive thinker' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'choose one film' is the wordplay.
'choose' becomes 'opt' (both can mean to pick something).
'one' becomes 'i' (Roman numeral).
'film' becomes 'mist' (to film over is to mist or fog over).
'opt'+'i'+'mist'='OPTIMIST'
'to' is the link.
Can you help me to learn more?
(Other definitions for optimist that I've seen before include "One always sees the glass as half-full" , "Panglossian type" , "Cheerful sort" , "One always tends to take a favourable view of things" , "One who always looks on the bright side" .)