Attention-seeker beginning to kick lout (3)
I believe the answer is:
oik
'lout' is the definition.
(I've seen this before)
'attention-seeker beginning to kick' is the wordplay.
'attention seeker' becomes 'oi' (exclamation used to attract attention).
'beginning to' says to take the initial letters.
The initial letter of 'kick' is 'k'.
'oi'+'k'='OIK'
(Other definitions for oik that I've seen before include "Twerp" , "Torah scroll cupboard" , "Lout" , "anti-social type" , "Uncouth person (colloq.)" .)