Big wave concerning navy doctor? (7)

I believe the answer is:

surgeon

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

'navy doctor?' is the definition.
(I've seen this before)

'big wave concerning' is the wordplay.
'big wave' becomes 'surge' (surge is a kind of wave. I am not sure about the 'big' bit.).
'concerning' becomes 'on' (both can mean 'in relation to').
'surge'+'on'='SURGEON'

Can you help me to learn more?

(Other definitions for surgeon that I've seen before include "Operating medical practitioner" , "Naval doctor" , "Medical operator" , "Sawbones" , "one performing in the theatre" .)

I've seen this clue in The Times.

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