On the sea, it turns up a lot in the southeast (5)

I believe the answer is:

spume

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'on the sea it' is the definition.
I can't judge whether this definition defines the answer.

'turns up a lot in the southeast' is the wordplay.
'turns' is a reversal indicator.
'a lot' becomes 'm'.
'in the' indicates putting letters inside.
'southeast' becomes 'se' (synonyms).
'up' reversed gives 'pu'.
'pu'+'m'='pum'
'pum' placed inside 'se' is 'SPUME'.

Can you help me to learn more?

(Other definitions for spume that I've seen before include "Surf" , "Sea foam, froth" , "Froth on waves" , "Foam on waves" .)

I've seen this clue in the Evening Standard.

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