Helpful information, as from a clause (4)
I believe the answer is:
clue
'helpful information' is the definition.
'clue' can be an answer for 'information' (clue is a kind of information). I'm not certain of the 'helpful' bit.
'as from a clause' is the wordplay.
'from' suggests deleting specific letters.
'clause' with 'as' taken away is 'CLUE'.
Can you help me to learn more?
(Other definitions for clue that I've seen before include "Crossword item" , "Aid to detection" , "Part of a crossword" , "Crossword aid" , "Indication, hint" .)