A small number helping almost everyone having high hopes (12)

I believe the answer is:
aspirational
'having high hopes' is the definition.
I can't tell whether this definition defines the answer.
'a small number helping almost everyone' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'number' becomes 'pi' (pi is a kind of number).
'helping' becomes 'ration' (a ration is a serving or helping).
'almost' means to remove the last letter (almost the whole word is kept).
'everyone' becomes 'all' (all people).
'all' with its last letter taken away is 'al'.
'a'+'s'+'pi'+'ration'+'al'='ASPIRATIONAL'
Can you help me to learn more?
(Other definitions for aspirational that I've seen before include "Characterised by a desire to be successful" , "Like those trying to succeed" , "Pertaining to hopes" , "Characterised by hope or ambition" , "After a role model" .)
