Right, chopped apple and fish, then abseiling (10)

'abseiling' is the definition.
Both the definition and answer are present participle verbs.
Perhaps there's an association between them I don't understand?

'right chopped apple and fish' is the wordplay.
'right' becomes 'r' (common abbreviation).
'chopped' indicates anagramming the letters (letters chopped or smashed up).
'and' is a charade indicator (letters next to each other).
'fish' becomes 'ling' (ling is a kind of fish).
'apple' with letters rearranged gives 'appel'.
'r'+'appel'+'ling'='RAPPELLING'

'then' is the link.

Can you help me to learn more?