Having run, boy runs into activity (8)
I believe the answer is:
laddered
'having run' is the definition.
I can't judge whether this defines the answer.
'boy runs into activity' is the wordplay.
'boy' becomes 'lad' (informal term for boy).
'runs' becomes 'r' (cricket abbreviation).
'into' indicates putting letters inside.
'activity' becomes 'deed' (I've seen this in other clues).
'r' inserted into 'deed' is 'dered'.
'lad'+'dered'='LADDERED'
Can you help me to learn more?
(Other definitions for laddered that I've seen before include "Guided around snake" , "(Of tights or stockings) having a run" , "Descriptive of a stocking with a run" , "23 25 [WARDROBE MALFUNCTION] perhaps?" , "ran" .)