Fellow that is connected with English navy (5)
I believe the answer is:
ernie
'fellow' is the definition.
(man's name)
'that is connected with english navy' is the wordplay.
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'connected with' is a charade indicator (letters next to each other).
'english' becomes 'E' (abbreviation).
'navy' becomes 'RN' (abbreviation for Royal Navy).
'e'+'rn'='ern'
'ie' put after 'ern' is 'ERNIE'.
(Other definitions for ernie that I've seen before include "Eric Morecambe & - - Wise" , "Eric's TV partner" , "Wise fellow" , "One regularly drawing" , "___ Wise, d. 1999" .)