In the world of boxing, is increasing (6)
I believe the answer is:
rising
'increasing' is the definition.
(rising is a kind of increasing)
'in the world of boxing is' is the wordplay.
'in' means one lot of letters goes inside another.
'the world of boxing' becomes 'ring' (I am not sure about this - if you are sure you should believe this answer much more).
'ring' placed around 'is' is 'RISING'.
Can you help me to learn more?
(Other definitions for rising that I've seen before include "Moving upward" , "Revolt; coming up" , "Upward rebellion?" , "Mutiny" , "In the ascendant" .)