Out of bed, the worse for wear, and tetchy (7)
I believe the answer is:
uptight
'tetchy' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'out of bed the worse for wear' is the wordplay.
'out of bed' becomes 'up' (synonyms).
'the worse for wear' becomes 'tight' (I am not sure about this - if you are sure you should believe this answer much more).
'up'+'tight'='UPTIGHT'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for uptight that I've seen before include "Unable to express one's feelings" , "Unable to relax" , "On edge" , "Informal word for nervously tense" , "Tip thug, being nervously tense" .)