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A big swimmer ran back somewhere in the centre with Henry (7)

Ross

I believe the answer is:

narwhal

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

'a big swimmer' is the definition.
'narwhal' can be an answer for 'swimmer' (I've seen this before). I also know that 'big' relates to this answer.

'ran back somewhere in the centre with henry' is the wordplay.
'back' says the letters should be written backwards.
'in the centre' means to look at the middle letters.
'with' means one lot of letters go next to another.
'henry' becomes 'hal' (short for Henry).
The middle letter of 'somewhere' is 'w'.
'ran' reversed gives 'nar'.
'nar'+'w'+'hal'='NARWHAL'

Can you help me to learn more?

(Other definitions for narwhal that I've seen before include "Ocean mammal" , "Arctic whale, the male having a long spiral ivory tusk" , "beast" , "Tusked marine creature" , "Arctic toothed whale" .)

I've seen this clue in the Sydney Morning Herald.
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