Surprisingly, most earn full amount (5,7)

I believe the answer is:

small fortune

'amount' is the definition.
(small fortune is a kind of amount)

'surprisingly most earn full' is the wordplay.
'surprisingly' is an anagram indicator.
'most'+'earn'+'full'='mostearnfull'
'mostearnfull' anagrammed gives 'SMALL FORTUNE'.

(Other definitions for small fortune that I've seen before include "Lots of money" , "But it's a large amount of money!" , "lot of money" , "Large sum of money" .)

I've seen this clue in The Telegraph.

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