Join search at home with energy (7)
I believe the answer is:
combine
'join' is the definition.
(thesaurus)
'search at home with energy' is the wordplay.
'search' becomes 'comb' (combing is a kind of searching).
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'with' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mc2).
'comb'+'in'+'e'='COMBINE'
(Other definitions for combine that I've seen before include "Put together" , "marry" , "Association" , "Join together" , "Unite; -- harvester" .)