Up for international title boxing the French (2,3,5)
I believe the answer is:
in the frame
'up' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'international title boxing the french' is the wordplay.
'international' becomes 'i' (abbreviation eg in IMF).
'title' becomes 'name' (I've seen this in another clue).
'boxing' means one lot of letters goes inside another ('box' can mean contain, as in to put in a box).
'french' becomes 'fr' (abbreviation).
'the'+'fr'='thefr'
'name' enclosing 'thefr' is 'ntheframe'.
'i'+'ntheframe'='IN THE FRAME'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for in the frame that I've seen before include "expected to receive reward?" , "Like mounted picture" , "Wanted by police" .)