Wally primarily talks with idiotic way of speaking (5)

I believe the answer is:

twirp

'wally' is the definition.
(both can mean a stupid person)

'primarily talks with idiotic way of speaking' is the wordplay.
'primarily' suggests taking the first letters.
'way of speaking' becomes 'rp' (Received Pronunciation, standard British accent).
The initial letters of 'talks with idiotic' is 'twi'.
'twi'+'rp'='TWIRP'

(Another definition for twirp that I've seen is " Idiot".)

Want a hint initially instead of a full solution? Install my app