Worth moving out of bed to be sick (5,2)
I believe the answer is:
throw up
'sick' is the definition.
('throw up' can be a synonym of 'sick')
'worth moving out of bed' is the wordplay.
'moving' is an anagram indicator.
'out of bed' becomes 'up' ('up' can be a synonym of 'out of bed').
'worth' is an anagram of 'throw'.
'throw'+'up'='THROW UP'
'to be' is the link.
(Other definitions for throw up that I've seen before include "Abandon (something)" , "Be sick" , "Produce - vomit" , "find" , "Vomit - relinquish" .)