Naval commander embraced by colonels only (6)
I believe the answer is:
nelson
'naval commander' is the definition.
(I've seen this before)
'embraced by colonels only' is the wordplay.
'embraced' indicates the answer is hidden within the clue.
'NELSON' can be found hidden inside 'by colonels only'.
(Other definitions for nelson that I've seen before include "northern town" , "Sea-lord who loved Lady Hamilton" , "English naval hero" , "... famous admiral" , "Victorious flag officer" .)