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Stop redhead finding a sweet (4,6)

Ross

I believe the answer is:

stem ginger

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'a sweet' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'stop redhead' is the wordplay.
'stop' becomes 'stem' (stemming is a kind of stopping).
'redhead' becomes 'ginger' (I've seen this in another clue).
'stem'+'ginger'='STEM GINGER'

'finding' acts as a link.

Can you help me to learn more?

(Other definitions for stem ginger that I've seen before include "Crystallised root" , "Merging set (anag.)" , "It's tasty" , "Plant root of a pungent spice" , "spicy ingredient" .)

I've seen this clue in The Daily Express.
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