One granted a large fortune has support (8)

I believe the answer is:

allottee

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'one granted' is the definition.
I can't tell whether this definition defines the answer.

'a large fortune has support' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'fortune' becomes 'lot' (as in a person's lot in life).
'has' means one lot of letters go next to another.
'support' becomes 'tee' (tee is a kind of support).
'a'+'l'+'lot'+'tee'='ALLOTTEE'

Can you help me to learn more?

(Other definitions for allottee that I've seen before include "Recipient" , "I get a share" .)

I've seen this clue in The Irish Times.

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