Bath's no.1 forward Thiebaud regularly getting sent off, the idiot (9)

I believe the answer is:

blockhead

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'sent off the idiot' is the definition.
I can't tell whether this definition defines the answer.

'bath's no 1 forward thiebaud regularly getting' is the wordplay.
'no l' suggests taking the first letters.
'forward' becomes 'lock' (I've seen this before**).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'getting' says to put letters next to each other.
The initial letter of 'baths' is 'b'.
The alternate letters of 'thiebaud' are 'head'.
'b'+'lock'+'head'='BLOCKHEAD'

Can you help me to learn more?

(Other definitions for blockhead that I've seen before include "Dolt" , "Stupid person" .)

I've seen this clue in The Telegraph.

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