The slipshod are likely to fall into it (5)
I believe the answer is:
error
'the slipshod are likely' is the definition.
I can't judge whether this definition defines the answer.
'fall into it' is the wordplay.
'fall' becomes 'err' (I've seen this in another clue).
'into it' becomes 'or' (I can't justify this - if you can you should give a lot more credence to this answer).
'err'+'or'='ERROR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for error that I've seen before include "Blunder or mistake" , "Mistake, lapse" , "Way of operating" , "Mistake or fault" , "Gaffe" .)