Bird (Romeo's second) managed to break bed (9)
I believe the answer is:
cormorant
'bird' is the definition.
(cormorant is a kind of bird)
'romeo's second managed to break bed' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'second' becomes 'mo' (both are short periods of time).
'managed' becomes 'ran' (I've seen this before**).
'to break' means one lot of letters goes inside another.
'bed' becomes 'cot' (cot is a kind of bed).
'r'+'mo'+'ran'='rmoran'
'rmoran' put inside 'cot' is 'CORMORANT'.
(Other definitions for cormorant that I've seen before include "Black diving bird" , "Large voracious sea bird" , "Large diving seabird" , "Aquatic bird" , "Large, voracious seabird" .)