Frenchman and visitor, losing way, default (7)
I believe the answer is:
renegue
'losing way default' is the definition.
'renegue' can be an answer for 'default' (I've seen this before). I am not certain of the 'losing way' bit.
'frenchman and visitor' is the wordplay.
'frenchman' becomes 'rene' (common French name).
'and' says to put letters next to each other.
'visitor' becomes 'gue' (I can't explain this - if you can you should believe this answer much more).
'rene'+'gue'='RENEGUE'
Can you help me to learn more?
(Other definitions for renegue that I've seen before include "Go back on (a promise)" , "Break one's word" , "Fall to fulfil promise" , "Fail to fulfil an obligation" , "Deny" .)