They're useful, also, for apprentices to work with (5)
I believe the answer is:
tools
'apprentices to work with' is the definition.
I can't judge whether this definition defines the answer.
'they're useful also' is the wordplay.
I cannot quite understand how this works, but
'also' could be 'too' (synonyms) and 'too' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for tools that I've seen before include "Implements used to carry out particular functions" , "'A bad workman blames his . . . . .'" , "workman's implements" , "Utensils" , "Devices or implements, as of the trade" .)