Odd non-U Labour man beaten (8)
I believe the answer is:
abnormal
'odd' is the definition.
(I've seen this before)
'non-u labour man beaten' is the wordplay.
'non' indicates named letters should be taken away.
'beaten' indicates an anagram (letters beaten up or destroyed).
'labour'+'man'='labourman'
'labourman' with 'u' taken away is 'laborman'.
'laborman' anagrammed gives 'ABNORMAL'.
(Other definitions for abnormal that I've seen before include "Deviating from the usual" , "Unorthodox" , "'Aberrant, atypical (8)'" , "like 15 [ANOMALIES]" , "Odd" .)