The naval hero is in the hold (6)
I believe the answer is:
nelson
This clue is a double definition.
'the naval hero' is the first definition.
(I've seen this before)
'the hold' is the second definition.
(wrestling hold)
'is in' is the link.
(Other definitions for nelson that I've seen before include "Victorious flag officer" , "'England expects' admiral" , "Horatio or Mandela?" , "English admiral, mortally wounded at Trafalgar" , "Emma Hamilton's lover, who died in battle on 21 October 1805" .)