Type of ferry carrying German and British during competition (5,5)
I believe the answer is:
round robin
'competition' is the definition.
(round robin is a kind of competition)
'type of ferry carrying german and british during' is the wordplay.
'type of ferry' becomes 'ro-ro' (I've seen this before).
'carrying' is an insertion indicator.
'german and' becomes 'und' ('and' in German).
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'during' becomes 'in' (I've seen this in other clues).
'roro' placed around 'und' is 'roundro'.
'roundro'+'b'+'in'='ROUND ROBIN'
(Other definitions for round robin that I've seen before include "note" , "Statement signed" , "Where mourning birds gathered" , "part of Christmas for some" , "Multi-signature letter" .)