Check power in Beetle perhaps (7)
I believe the answer is:
inspect
'check' is the definition.
(thesaurus)
'power in beetle perhaps' is the wordplay.
'power' becomes 'p'.
'in' indicates putting letters inside.
'beetle perhaps' becomes 'insect' (beetle is a kind of insect).
'p' placed inside 'insect' is 'INSPECT'.
(Other definitions for inspect that I've seen before include "Scan" , "Examine closely" , "Look at closely" , "Scrutinize, audit" , "Look critically at" .)