Theban king about to rip off trousers (5)

I believe the answer is:

creon

'theban king' is the definition.
(figure of Greek myth)

'about to rip off trousers' is the wordplay.
'about' becomes 're' (regarding**).
'to rip off' becomes 'con' (conning is a kind of ripping off).
'trousers' indicates putting letters inside (to trouser can mean to contain or hold).
're' inserted into 'con' is 'CREON'.

I've seen this clue in The Guardian.

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