Is ignoring problem? Take legal action! (3)
I believe the answer is:
sue
'take legal action' is the definition.
(I've seen this in another clue)
'is ignoring problem?' is the wordplay.
'ignoring' suggests deleting specific letters.
'problem?' becomes 'issue' (issue can mean a problem or difficulty).
'issue' with 'is' taken away is 'SUE'.
(Other definitions for sue that I've seen before include "Institute legal proceedings (against someone)" , "Apply" , "Charge" , "Take a casa against (3)" , "The girl to take to court" .)