He didn't lose at sea in the centre of channels (6)
I believe the answer is:
nelson
'he didn't' is the definition.
The definition suggests a singular noun which matches the answer.
'lose at sea in the centre of channels' is the wordplay.
'at sea' indicates anagramming the letters.
'in the' indicates putting letters inside.
'centre of' means to look at the middle letters.
The centre of 'channels' is 'nn'.
'lose' with letters rearranged gives 'elso'.
'elso' inserted within 'nn' is 'NELSON'.
Can you help me to learn more?
(Other definitions for nelson that I've seen before include "Tar" , "18th century admiral" , "Sailor" , "northern town" , "Lady Hamilton's admiral lover" .)