Run with Jack after what reduction in speed? (5)
I believe the answer is:
rehab
'reduction in speed?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'run with jack after what' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'with' means one lot of letters go next to another.
'jack' becomes 'ab' (both can mean a sailor).
'after' is a charade indicator (letters next to each other).
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'ab' after 'eh' is 'ehab'.
'r'+'ehab' is 'REHAB'.
Can you help me to learn more?
(Other definitions for rehab that I've seen before include "convalescent home?" , "Treatment for addicts (abbrev.)" , "Process of restoring, eg, an addict to health" , "Treatment for dependency" , "Training and therapy after drug abuse" .)