All-purpose taser shot into base (9)
I believe the answer is:
versatile
'all-purpose' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I don't see?
'taser shot into base' is the wordplay.
'shot' indicates anagramming the letters.
'into' indicates putting letters inside.
'base' becomes 'vile' (synonyms).
'taser' with letters rearranged gives 'ersat'.
'ersat' placed within 'vile' is 'VERSATILE'.
Can you help me to learn more?
(Other definitions for versatile that I've seen before include "variable" , "Adapting easily to different tasks" , "Flexible" , "Multiskilled" , "elastic!" .)