Tackle software bug (8)
I believe the answer is:
approach
'tackle' is the definition.
(thesaurus)
'software bug' is the wordplay.
'software' becomes 'app' (software application).
'bug' becomes 'roach' (short for cockroach).
'app'+'roach'='APPROACH'
(Other definitions for approach that I've seen before include "Get closer to" , "Drae near" , "Resemble" , "What happens before landing" , "Come near - means of access" .)