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Separate underwater swimmer, say, surfacing (7)

Ross

I believe the answer is:

diverge

I'm a little stuck... Click here to teach me more about this clue!

'separate' is the definition.
(I've seen this before)

'underwater swimmer say surfacing' is the wordplay.
'underwater swimmer' becomes 'diver' (diver is a kind of swimmer. I am not sure about the 'underwater' bit.).
'say' becomes 'eg' (both can mean 'for example').
'surfacing' is a reversal indicator (as opposed to capsizing).
'eg' written backwards gives 'ge'.
'diver'+'ge'='DIVERGE'

Can you help me to learn more?

(Other definitions for diverge that I've seen before include "Bifurcate" , "Drift apart" , "Go different ways" , "Branch off" , "Move away from" .)

I've seen this clue in The Telegraph.
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