Impossible problem getting catch on this rugby line (6-3)
I believe the answer is:
twenty-two
'rugby line' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe there's an association between them I don't understand?
'impossible problem getting catch on' is the wordplay.
'impossible problem getting' becomes 'twenty' (I can't justify this - if you can you should believe this answer much more).
'catch' indicates a 'sounds like' (homophone) clue (catch can mean hear).
'on' becomes 'to'.
'to' sounds like 'two'.
'twenty'+'two'='TWENTY-TWO'
'this' is the link.
Can you help me to learn more?
(Other definitions for twenty-two that I've seen before include "How many players at Wembley" , "mark made on pitch" , "See 20" , "Number of yards in a chain" , "Number of players on pitch at start of soccer match" .)