Engineer tangles up DIY tool (6,3)
I believe the answer is:
staple gun
'diy tool' is the definition.
(tool used in DIY projects)
'engineer tangles up' is the wordplay.
'engineer' indicates anagramming the letters.
'tangles'+'up'='tanglesup'
'tanglesup' is an anagram of 'STAPLE GUN'.
(Other definitions for staple gun that I've seen before include "One that fires those fixing" , "Tool for inserting fasteners" .)