Crossword Genius

Small sum we might invest in American prospector (9)

Ross

I believe the answer is:

sourdough

'american prospector' is the definition.
(historical term for an American gold prospector)

'small sum we might invest' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'sum we might invest' becomes 'our dough' (dough belonging to us).
's'+'ourdough'='SOURDOUGH'

'in' is the link.

(Other definitions for sourdough that I've seen before include "Type of bread" , "Fermenting bread mixture - odour hugs (anag)" , "Leaven for making bread" .)

I've seen this clue in The Times.
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