Last week and now, who bothers with expertise? (4-3)
I believe the answer is:
know-how
'expertise?' is the definition.
(I've seen this before)
'last week and now who bothers' is the wordplay.
'last' says to take the final letters.
'and' says to put letters next to each other.
'bothers' indicates an anagram (I've seen 'bother' mean this).
The final letter of 'week' is 'k'.
'who' anagrammed gives 'how'.
'k'+'now'+'how'='KNOW-HOW'
'with' acts as a link.
(Other definitions for know-how that I've seen before include "Technique, expertise" , "Specialised skill" , "Practical knowledge or skill" , "Ingenuity - aptitude - skill" , "Ingenuity - experience" .)