Wave from queen on holiday (7)
I believe the answer is:
breaker
'wave' is the definition.
(I know that breaker is a type of wave)
'queen on holiday' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'on' says to put letters next to each other.
'holiday' becomes 'break' (break can mean a holiday or time off).
'er' put after 'break' is 'BREAKER'.
'from' is the link.
(Other definitions for breaker that I've seen before include "one stopping, might you say?" , "Someone broadcasting on Citizen's Band radio" , "Large sea wave" , "Wave hitting the shore" , "Wave with white crest" .)