Beaten unconscious, university lecturer has little energy (7)
I believe the answer is:
outdone
'beaten' is the definition.
(I've seen this before)
'unconscious university lecturer has little energy' is the wordplay.
'unconscious' becomes 'out' ('out' can be similar in meaning to 'unconscious').
'university lecturer' becomes 'don' (I've seen this before).
'has' means one lot of letters go next to another.
'little' suggests taking the first letters.
The initial letter of 'energy' is 'e'.
'out'+'don'+'e'='OUTDONE'
(Other definitions for outdone that I've seen before include "Gone one better" , "Excelled" , "beaten" , "Surpassed" .)