Wake up in bed containing Eccles and Oscar (4,2)
I believe the answer is:
come to
'wake up' is the definition.
(eg coming to after fainting)
'bed containing eccles and oscar' is the wordplay.
'bed' becomes 'cot' (cot is a kind of bed).
'containing' means one lot of letters goes inside another.
'eccles' becomes 'me' (where the crossword setter is 'Eccles').
'and' means one lot of letters go next to another.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'cot' enclosing 'me' is 'comet'.
'comet'+'o'='COME TO'
'in' acts as a link.
(Other definitions for come to that I've seen before include "Wake up" , "Start fighting" , "Recover consciousness or arrive at" , "Total" , "Attend" .)